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x in (-oo:+oo)
y = (3/2)*x-20 // - (3/2)*x-20
y-((3/2)*x)+20 = 0
(-3/2)*x+y+20 = 0
y-3/2*x+20 = 0 // - y+20
-3/2*x = -(y+20) // : -3/2
x = (-(y+20))/(-3/2)
x = 2/3*(y+20)
x = 2/3*(y+20)
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