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5*x+x-(4/7) = -4 // + 4
5*x+x-(4/7)+4 = 0
5*x+x-4/7+4 = 0
6*x+24/7 = 0 // - 24/7
6*x = -24/7 // : 6
x = -24/7/6
x = -4/7
x = -4/7
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