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x in (-oo:+oo)
7/3 = x/27 // - x/27
7/3-(x/27) = 0
7/3-1/27*x = 0 // - 7/3
-1/27*x = -7/3 // : -1/27
x = -7/3/(-1/27)
x = 63
x = 63
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