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