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x in (-oo:+oo)
x/12 = 120/144 // - 120/144
x/12-(120/144) = 0
x/12-5/6 = 0
1/12*x-5/6 = 0 // + 5/6
1/12*x = 5/6 // : 1/12
x = 5/6/1/12
x = 10
x = 10
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