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x in (-oo:+oo)
x/120 = 1/15 // - 1/15
x/120-(1/15) = 0
x/120-1/15 = 0
1/120*x-1/15 = 0 // + 1/15
1/120*x = 1/15 // : 1/120
x = 1/15/1/120
x = 8
x = 8
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