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x in (-oo:+oo)
y = (-10/7)*x-8 // - (-10/7)*x-8
y-((-10/7)*x)+8 = 0
(10/7)*x+y+8 = 0
10/7*x+y+8 = 0 // - y+8
10/7*x = -(y+8) // : 10/7
x = (-(y+8))/10/7
x = -7/10*(y+8)
x = -7/10*(y+8)
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