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2x = 15 - 7
2x = 8
x = 8/2
x = 4
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5x - 1 = - 15
5x = - 15 + 1
5x = - 14
x = -14/5
---------------------------
4x - 3 = 21
4x = 21 + 3
4x = 24
x = 24/4
x = 6
--------------------------
- 2 = 2x - 8
- 2x = - 8 + 2
- 2x = - 6
x = -6/-2
x = 3