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4*x-(2/7) = (5*x)/8 // - (5*x)/8
4*x-((5*x)/8)-(2/7) = 0
4*x+(-5/8)*x-2/7 = 0
27/8*x-2/7 = 0 // + 2/7
27/8*x = 2/7 // : 27/8
x = 2/7/27/8
x = 16/189
x = 16/189
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