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x in (-oo:+oo)
y = -((5/2)*x)-7 // + -((5/2)*x)-7
(5/2)*x+y+7 = 0
5/2*x+y+7 = 0 // - y+7
5/2*x = -(y+7) // : 5/2
x = (-(y+7))/5/2
x = -2/5*(y+7)
x = -2/5*(y+7)
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