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x in (-oo:+oo)
y = (-8/7)*x-8 // - (-8/7)*x-8
y-((-8/7)*x)+8 = 0
(8/7)*x+y+8 = 0
8/7*x+y+8 = 0 // - y+8
8/7*x = -(y+8) // : 8/7
x = (-(y+8))/8/7
x = -7/8*(y+8)
x = -7/8*(y+8)
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