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6*x-8 = 8*x-((1/7)*x)+5 // - 8*x-((1/7)*x)+5
6*x-(8*x)+(1/7)*x-8-5 = 0
6*x-8*x+(1/7)*x-8-5 = 0
-13/7*x-13 = 0 // + 13
-13/7*x = 13 // : -13/7
x = 13/(-13/7)
x = -7
x = -7
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