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x in (-oo:+oo)
12/7 = 78*x // - 78*x
12/7-(78*x) = 0
12/7-78*x = 0
12/7-78*x = 0 // - 12/7
-78*x = -12/7 // : -78
x = -12/7/(-78)
x = 2/91
x = 2/91
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