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x in (-oo:+oo)
30/12 = x/120 // - x/120
30/12-(x/120) = 0
5/2-1/120*x = 0 // - 5/2
-1/120*x = -5/2 // : -1/120
x = -5/2/(-1/120)
x = 300
x = 300
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