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x in (-oo:+oo)
y = (2/5)*x-3 // - (2/5)*x-3
y-((2/5)*x)+3 = 0
(-2/5)*x+y+3 = 0
y-2/5*x+3 = 0 // - y+3
-2/5*x = -(y+3) // : -2/5
x = (-(y+3))/(-2/5)
x = 5/2*(y+3)
x = 5/2*(y+3)
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