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x in (-oo:+oo)
42/45 = x/9 // - x/9
42/45-(x/9) = 0
14/15-1/9*x = 0 // - 14/15
-1/9*x = -14/15 // : -1/9
x = -14/15/(-1/9)
x = 42/5
x = 42/5
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