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4*x-((3*x)/7)-(1/7) = -7 // + 7
4*x-((3*x)/7)-(1/7)+7 = 0
4*x+(-3/7)*x-1/7+7 = 0
25/7*x+48/7 = 0 // - 48/7
25/7*x = -48/7 // : 25/7
x = -48/7/25/7
x = -48/25
x = -48/25
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