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x in (-oo:+oo)
y+1 = (6/7)*x+2*(6/7) // - (6/7)*x+2*(6/7)
y-((6/7)*x)-(2*(6/7))+1 = 0
(-6/7)*x+y-12/7+1 = 0
y-6/7*x-5/7 = 0 // - y-5/7
-6/7*x = -(y-5/7) // : -6/7
x = (-(y-5/7))/(-6/7)
x = -7/6*(5/7-y)
x = -7/6*(5/7-y)
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