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x in (-oo:+oo)
508/285 = (4/15)*x // - (4/15)*x
508/285-((4/15)*x) = 0
(-4/15)*x+508/285 = 0
508/285-4/15*x = 0 // - 508/285
-4/15*x = -508/285 // : -4/15
x = -508/285/(-4/15)
x = 127/19
x = 127/19
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