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x in (-oo:+oo)
y = (5/2)*x-10 // - (5/2)*x-10
y-((5/2)*x)+10 = 0
(-5/2)*x+y+10 = 0
y-5/2*x+10 = 0 // - y+10
-5/2*x = -(y+10) // : -5/2
x = (-(y+10))/(-5/2)
x = 2/5*(y+10)
x = 2/5*(y+10)
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