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0.4*x-(1/2) = 3-0.2*x // - 3-0.2*x
0.4*x-(-0.2*x)-(1/2)-3 = 0
0.4*x+0.2*x-1/2-3 = 0
0.6*x-7/2 = 0 // + 7/2
0.6*x = 7/2 // : 0.6
x = 7/2/0.6
x = 5.83333333
x = 5.83333333
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