2x + 3 = x - 9
- x + 2x + 3 = - 9
x + 3 = - 9
x = - 9 - 3
x = - 11
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2x + 3 = x - 9
- x + 2x + 3 = - 9
x + 3 = - 9
x = - 9 - 3
x = - 11