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