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6*x+(6/7)*x-1 = -439/7 // + -439/7
6*x+(6/7)*x-(-439/7)-1 = 0
6*x+(6/7)*x+439/7-1 = 0
48/7*x+432/7 = 0 // - 432/7
48/7*x = -432/7 // : 48/7
x = -432/7/48/7
x = -9
x = -9
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