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-6 = (-3/7)*x // - (-3/7)*x
-((-3/7)*x)-6 = 0
(3/7)*x-6 = 0
3/7*x-6 = 0 // + 6
3/7*x = 6 // : 3/7
x = 6/3/7
x = 14
x = 14
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