30. 9a -3a +5a = +11a
9a +5a = 14a 14 -3 = +11a
-3a = -3a
31. -8x +9x –x = 0
+ 9x = + 9x +9 -9 = 0
-8x -1x = -9x
32. 12mn -23mn -5mn = -16mn
12mn = +12mn +12 -28 = -16mn
-23mn -5mn = -28mn
33. –x +19x -18x = 0
+19x = +19x +19 -19 = 0
-1x -18x = -19x
34. 19m -10m +6m = +14m
19m +6m = +25m +25 -10 = +14m
-10m = -10m
35. -11ab -15ab +26ab = 0
-11ab -15ab = -26ab -26 +26 = 0
+26ab = +26ab
36. -5ax +9ax -35ax = -31ax
-5ax -35ax = -40ax -40 +9 = -31ax
+9ax = +9ax
37.-24ax+2 -15ax+2 +39ax+2 = 0
-24ax+2 -15ax+2 = -39ax+2
+39ax+2 = +39ax+2 -39 +39 = 0
38. 2/3y +1/3y –y = 0
2/3y +1/3y = +9/9 6+3/9= 9/9
-1 = -1 +9/9 – 1/1 = 0
39. -3/5m +1/4m -1/2m = - 54/40m
-3/5m -1/2m = -11/10m 6-5/10 = 11/10
+1/4 = +1/4m
-11/10 +1/4 = -44+10/40 = -54/40
40. 3/8a2b +1/4a2b –a2b = +52/32 a2b
3/8 a2b +1/4 a2b = +20/32 a2b
12+8/32 = +20/32
-1 a2b = -1 a2b
+20/32 -1/1 = 20+32/32 = +52/32
41. –a +8 a +9 a -15 a = -1 a
+8 a +9 a = +17 a +17 -16 = -1
-15 a – 1 a = -16 a
42. 7 ab -11 ab +20 ab -31 ab = -25 ab
+7 ab +20 ab = +27 ab +27 -42 = -25
-11 ab -31 ab = -42 ab
43. 25x2 – 50x2 +11x2 +14x2 = 0
25x2 +14x2 +11x2 = +50x2
-50x2 = -50x2 50 – 50 = 0
44. –Xy -8xy -19xy +40xy = +12xy
-1xy -8xy -19xy = -28xy 40 – 28 = 12
+40xy = +40xy
45. 7ab +21ab –ab -80ab = -53ab
7ab +21ab = +28ab 81 – 28 =53
-1ab -80ab = -81ab
46. -25xy2 +11xy2 +60xy2 -82xy2 = -36xy
-25xy -82xy2 = -107xy2 107 – 71 = 36
+11xy2 +60xy2 = +71xy2
47. -72ax +87ax -101ax +243ax = +157ax
-72ax -101ax = -173ax 330 – 173 = 157
+87ax +243ax = +330ax
48. -82bx -71bx -53bx +206bx = 0
-82bx -71bx -53bx = -206bx
+206bx = +206bx 206 – 206 = 0
49. 105a3 -464a3 +58a3 +301a3 = 0
105a3 +58a3 +301a3 = +464a3
-464a3 = -464a3 464 – 464 =0
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