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x in (-oo:+oo)
2/18 = x/36 // - x/36
2/18-(x/36) = 0
1/9-1/36*x = 0 // - 1/9
-1/36*x = -1/9 // : -1/36
x = -1/9/(-1/36)
x = 4
x = 4
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