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2*((1/5)*x-3)+x = 4*((1/4)*x-(1/2)) // - 4*((1/4)*x-(1/2))
2*((1/5)*x-3)-(4*((1/4)*x-(1/2)))+x = 0
2*((1/5)*x-3)-4*((1/4)*x-1/2)+x = 0
2*(1/5*x-3)-4*(1/4*x-1/2)+x = 0
2*(1/5*x-3)-4*(1/4*x-1/2)+x = 0
x-3/5*x-4 = 0
2/5*x-4 = 0
2/5*x-4 = 0
2/5*x-4 = 0 // + 4
2/5*x = 4 // : 2/5
x = 4/2/5
x = 10
x = 10
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