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x in (-oo:+oo)
7/3 = x/13 // - x/13
7/3-(x/13) = 0
7/3-1/13*x = 0 // - 7/3
-1/13*x = -7/3 // : -1/13
x = -7/3/(-1/13)
x = 91/3
x = 91/3
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