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X in (-oo:+oo)
60/(-12) = (-12*X)/(-12) // - (-12*X)/(-12)
60/(-12)-((-12*X)/(-12)) = 0
60/(-12)-X = 0
-X-5 = 0 // + 5
-X = 5 // * -1
X = -5
X = -5
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