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x in (-oo:+oo)
(1/4)*y+3 = -5*x // + -5*x
(1/4)*y-(-5*x)+3 = 0
5*x+(1/4)*y+3 = 0
5*x+1/4*y+3 = 0 // - 1/4*y+3
5*x = -(1/4*y+3) // : 5
x = (-(1/4*y+3))/5
x = (-(1/4*y+3))/5
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