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-(5*x)-8 = (-3/7)*x+264/7 // - (-3/7)*x+264/7
-(5*x)-((-3/7)*x)-(264/7)-8 = 0
(3/7)*x-5*x-264/7-8 = 0
-32/7*x-320/7 = 0 // + 320/7
-32/7*x = 320/7 // : -32/7
x = 320/7/(-32/7)
x = -10
x = -10
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