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x in (-oo:+oo)
-x-((6/7)*y) = -4/7 // + -4/7
-x-((6/7)*y)-(-4/7) = 0
(-6/7)*y-x+4/7 = 0
4/7-x-6/7*y = 0 // - 4/7-6/7*y
-x = -(4/7-6/7*y) // * -1
x = 4/7-6/7*y
x = 4/7-6/7*y
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