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