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x in (-oo:+oo)
-((11/7)*x)-5/7 = -y // + y
y-((11/7)*x)-5/7 = 0
(-11/7)*x+y-5/7 = 0
y-11/7*x-5/7 = 0 // - y-5/7
-11/7*x = -(y-5/7) // : -11/7
x = (-(y-5/7))/(-11/7)
x = -7/11*(5/7-y)
x = -7/11*(5/7-y)
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