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4*x-(2*x)-(1*0.5^3) = 1/8-x // - 1/8-x
4*x-(2*x)+x-(1*0.5^3)-(1/8) = 0
4*x-2*x+x-0.5^3-1/8 = 0
3*x-0.5^3-1/8 = 0 // + 0.5^3+1/8
3*x = 0.5^3+1/8 // : 3
x = (0.5^3+1/8)/3
x = (0.5^3+1/8)/3
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