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