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x in (-oo:+oo)
7/3 = x/18 // - x/18
7/3-(x/18) = 0
7/3-1/18*x = 0 // - 7/3
-1/18*x = -7/3 // : -1/18
x = -7/3/(-1/18)
x = 42
x = 42
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