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x in (-oo:+oo)
y = (5/7)*x+1 // - (5/7)*x+1
y-((5/7)*x)-1 = 0
(-5/7)*x+y-1 = 0
y-5/7*x-1 = 0 // - y-1
-5/7*x = -(y-1) // : -5/7
x = (-(y-1))/(-5/7)
x = -7/5*(1-y)
x = -7/5*(1-y)
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