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4*x-(2*y) = 1/2 // - 1/2
4*x-(2*y)-(1/2) = 0
4*x-2*y-1/2 = 0
4*x-2*y-1/2 = 0 // + -2*y-1/2
4*x = -(-2*y-1/2) // : 4
x = (-(-2*y-1/2))/4
x = (1/2-(-2*y))/4
x = (1/2-(-2*y))/4
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