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x in (-oo:+oo)
x/4-y = -3/4 // + -3/4
x/4-y-(-3/4) = 0
x/4-y+3/4 = 0
1/4*x-y+3/4 = 0 // - 3/4-y
1/4*x = -(3/4-y) // : 1/4
x = (-(3/4-y))/1/4
x = 4*(y-3/4)
x = 4*(y-3/4)
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