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a.3x - 10 = 5x - 20
- 10 + 20 = 5x - 3x
10 = 2x
10/2 = x
5 = x
b. 1x + 6 = 1x + 12 ⇒ dikali 6 ⇒ 3x + 36 = 2x + 72
2 3 3x - 2x = 72 - 36
x = 36