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x in (-oo:+oo)
4/9 = x/63 // - x/63
4/9-(x/63) = 0
4/9-1/63*x = 0 // - 4/9
-1/63*x = -4/9 // : -1/63
x = -4/9/(-1/63)
x = 28
x = 28
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