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x in (-oo:+oo)
y = (4/5)*x-10 // - (4/5)*x-10
y-((4/5)*x)+10 = 0
(-4/5)*x+y+10 = 0
y-4/5*x+10 = 0 // - y+10
-4/5*x = -(y+10) // : -4/5
x = (-(y+10))/(-4/5)
x = 5/4*(y+10)
x = 5/4*(y+10)
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