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x in (-oo:+oo)
21/14 = x/58 // - x/58
21/14-(x/58) = 0
3/2-1/58*x = 0 // - 3/2
-1/58*x = -3/2 // : -1/58
x = -3/2/(-1/58)
x = 87
x = 87
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