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x in (-oo:+oo)
5/6 = x/30 // - x/30
5/6-(x/30) = 0
5/6-1/30*x = 0 // - 5/6
-1/30*x = -5/6 // : -1/30
x = -5/6/(-1/30)
x = 25
x = 25
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