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x in (-oo:+oo)
x/12 = 10/30 // - 10/30
x/12-(10/30) = 0
x/12-1/3 = 0
1/12*x-1/3 = 0 // + 1/3
1/12*x = 1/3 // : 1/12
x = 1/3/1/12
x = 4
x = 4
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