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x in (-oo:+oo)
y = (-5/9)*x-7 // - (-5/9)*x-7
y-((-5/9)*x)+7 = 0
(5/9)*x+y+7 = 0
5/9*x+y+7 = 0 // - y+7
5/9*x = -(y+7) // : 5/9
x = (-(y+7))/5/9
x = -9/5*(y+7)
x = -9/5*(y+7)
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