| a) 6x - (8x - 10) = 87 - (21 + 10x) |
| 6x - 8x + 10 = 87 - 21 - 10x |
| -2x + 10 = 66 - 10x |+10x |
| 8x + 10 = 66 |-10 |
| 8x = 56 |:8 |
| x = 7 |
| |
| b) 7 - (10 - 8x) = 23 - (4 + 14x) |
| 7 - 10 + 8x = 23 - 4 - 14x |
| -3 + 8x = 19 - 14x |+14x |
| -3 + 22x = 19 |+3 |
| 22x = 22 |:22 |
| x = 1 |
| |
| c) (19x - 17) - (3x - 72) = -13 + (13x + 83) |
| 19x - 17 - 3x + 72 = -13 + 13x + 83 |
| 16x + 55 = 70 + 13x |-13x |
| 3x + 55 = 70 |-55 |
| 3x = 15 |:3 |
| x = 5 |
| |
| d) (17x + 22) - (5x + 9) = (11x + 15) - (22 - 21x) |
| 17x + 22 - 5x - 9 = 11x + 15 - 22 + 21x |
| 12x + 13 = 32x - 7 |-32x |
| -20x + 13 = -7 |-13 |
| -20x = -20 |:(-20) |
| x = 1 |
| |
| e) (42x + 37) - (26 - 34x) = 26x + 211 |
| 42x + 37 - 26 + 34x = 26x + 211 |
| 76x + 11 = 26x + 211 |-26x |
| 50x + 11 = 211 |-11 |
| 50x = 200 |:50 |
| x = 4 |
|
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