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6/7 = -2*x-(8/7) // + -2*x-(8/7)
6/7-(-2*x)+8/7 = 0
2*x+6/7+8/7 = 0
2*x+2 = 0 // - 2
2*x = -2 // : 2
x = -2/2
x = -1
x = -1
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