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x in (-oo:+oo)
5/7 = x/63 // - x/63
5/7-(x/63) = 0
5/7-1/63*x = 0 // - 5/7
-1/63*x = -5/7 // : -1/63
x = -5/7/(-1/63)
x = 45
x = 45
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