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X in (-oo:+oo)
X/36 = 21/27 // - 21/27
X/36-(21/27) = 0
X/36-7/9 = 0
1/36*X-7/9 = 0 // + 7/9
1/36*X = 7/9 // : 1/36
X = 7/9/1/36
X = 28
X = 28
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