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x = 6/2
x = 3
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2x - 3 = 6 + x
2x - x = 6 + 3
x = 9
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6x - 7 = 2x + 5
6x - 2x = 5 + 7
4x = 12
x = 12/4
x = 3
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4 (x - 10) = 6 (2 - x) - 6x
4x - 40 = 12 - 6x - 6x
4x + 6x + 6x = 12 + 40
16x = 52
x = 52/16
x = 13/4