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x in (-oo:+oo)
x = (3*y)/13 // - (3*y)/13
x-((3*y)/13) = 0
x+(-3/13)*y = 0
x-3/13*y = 0 // + -3/13*y
x = -(-3/13*y)
x = 3/13*y
x = 3/13*y
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