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x in (-oo:+oo)
x/12 = 15/60 // - 15/60
x/12-(15/60) = 0
x/12-1/4 = 0
1/12*x-1/4 = 0 // + 1/4
1/12*x = 1/4 // : 1/12
x = 1/4/1/12
x = 3
x = 3
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