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x in (-oo:+oo)
(3/7)*y = (18/7)*x // - (18/7)*x
(3/7)*y-((18/7)*x) = 0
(-18/7)*x+(3/7)*y = 0
3/7*y-18/7*x = 0 // - 3/7*y
-18/7*x = -(3/7*y) // : -18/7
x = (-(3/7*y))/(-18/7)
x = 1/6*y
x = 1/6*y
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