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