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x in (-oo:+oo)
(9/7)*x-((7/6)*y) = -55/3 // + -55/3
(9/7)*x-((7/6)*y)-(-55/3) = 0
(9/7)*x+(-7/6)*y+55/3 = 0
9/7*x-7/6*y+55/3 = 0 // - 55/3-7/6*y
9/7*x = -(55/3-7/6*y) // : 9/7
x = (-(55/3-7/6*y))/9/7
x = -7/9*(55/3-7/6*y)
x = -7/9*(55/3-7/6*y)
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