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5*(x-0.4) = 0.5*x-(0.5/2) // - 0.5*x-(0.5/2)
5*(x-0.4)-(0.5*x)+0.5/2 = 0
5*(x-0.4)-0.5*x+0.5/2 = 0
5*(x-0.4)-0.5*x+0.25 = 0
5*(x-0.4)-0.5*x+0.25 = 0
4.5*x-2+0.25 = 0
4.5*x-1.75 = 0
4.5*x-1.75 = 0
4.5*x-1.75 = 0 // + 1.75
4.5*x = 1.75 // : 4.5
x = 1.75/4.5
x = 0.38888889
x = 0.38888889
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