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