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x in (-oo:+oo)
x/12 = 30/60 // - 30/60
x/12-(30/60) = 0
x/12-1/2 = 0
1/12*x-1/2 = 0 // + 1/2
1/12*x = 1/2 // : 1/12
x = 1/2/1/12
x = 6
x = 6
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