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x in (-oo:+oo)
y+7 = (-2/5)*(x+1) // - (-2/5)*(x+1)
y-((-2/5)*(x+1))+7 = 0
(2/5)*(x+1)+y+7 = 0
2/5*(x+1)+y+7 = 0
2/5*(x+1)+y+7 = 0
2/5*x+y+2/5+7 = 0
2/5*x+y+37/5 = 0
2/5*x+y+37/5 = 0
2/5*x+y+37/5 = 0 // - y+37/5
2/5*x = -(y+37/5) // : 2/5
x = (-(y+37/5))/2/5
x = -5/2*(y+37/5)
x = -5/2*(y+37/5)
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