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