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x in (-oo:+oo)
(31/6)*x = (93/6)*y // - (93/6)*y
(31/6)*x-((93/6)*y) = 0
(31/6)*x+(-31/2)*y = 0
31/6*x-31/2*y = 0 // + -31/2*y
31/6*x = -(-31/2*y) // : 31/6
x = (-(-31/2*y))/31/6
x = 3*y
x = 3*y
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