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x in (-oo:+oo)
y = (-7/8)*x-1.75 // - (-7/8)*x-1.75
y-((-7/8)*x)+1.75 = 0
(7/8)*x+y+1.75 = 0
7/8*x+y+1.75 = 0 // - y+1.75
7/8*x = -(y+1.75) // : 7/8
x = (-(y+1.75))/7/8
x = -8/7*(y+1.75)
x = -8/7*(y+1.75)
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