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x in (-oo:+oo)
5*y = (3/4)*x+20 // - (3/4)*x+20
5*y-((3/4)*x)-20 = 0
(-3/4)*x+5*y-20 = 0
5*y-3/4*x-20 = 0 // - 5*y-20
-3/4*x = -(5*y-20) // : -3/4
x = (-(5*y-20))/(-3/4)
x = -4/3*(20-(5*y))
x = -4/3*(20-(5*y))
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