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x in (-oo:+oo)
8/36 = x/63 // - x/63
8/36-(x/63) = 0
2/9-1/63*x = 0 // - 2/9
-1/63*x = -2/9 // : -1/63
x = -2/9/(-1/63)
x = 14
x = 14
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