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x in (-oo:+oo)
5/13 = x/78 // - x/78
5/13-(x/78) = 0
5/13-1/78*x = 0 // - 5/13
-1/78*x = -5/13 // : -1/78
x = -5/13/(-1/78)
x = 30
x = 30
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