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