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x in (-oo:+oo)
(5/6)*x-((8/21)*y) = 4/7 // - 4/7
(5/6)*x-((8/21)*y)-(4/7) = 0
(5/6)*x+(-8/21)*y-4/7 = 0
5/6*x-8/21*y-4/7 = 0 // + -8/21*y-4/7
5/6*x = -(-8/21*y-4/7) // : 5/6
x = (-(-8/21*y-4/7))/5/6
x = 6/5*(4/7-(-8/21*y))
x = 6/5*(4/7-(-8/21*y))
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