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x in (-oo:+oo)
2/240 = x/12 // - x/12
2/240-(x/12) = 0
1/120-1/12*x = 0 // - 1/120
-1/12*x = -1/120 // : -1/12
x = -1/120/(-1/12)
x = 1/10
x = 1/10
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