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a -3 x = 2x - 10
B 2x - 2 = 7 - x
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-3x = 2x - 10
-3x - 2x = -10
-5x = -10 /:(-5)
x = 2
b)
2x - 2 = 7 - x
2x + x = 7 + 2
3x = 9 /:3
x = 3