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x in (-oo:+oo)
y = (-1/3)*x-7 // - (-1/3)*x-7
y-((-1/3)*x)+7 = 0
(1/3)*x+y+7 = 0
1/3*x+y+7 = 0 // - y+7
1/3*x = -(y+7) // : 1/3
x = (-(y+7))/1/3
x = -3*(y+7)
x = -3*(y+7)
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