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x in (-oo:+oo)
5/29 = x/87 // - x/87
5/29-(x/87) = 0
5/29-1/87*x = 0 // - 5/29
-1/87*x = -5/29 // : -1/87
x = -5/29/(-1/87)
x = 15
x = 15
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