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x in (-oo:+oo)
1/12 = x/30 // - x/30
1/12-(x/30) = 0
1/12-1/30*x = 0 // - 1/12
-1/30*x = -1/12 // : -1/30
x = -1/12/(-1/30)
x = 5/2
x = 5/2
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