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x in (-oo:+oo)
x/12 = 5/30 // - 5/30
x/12-(5/30) = 0
x/12-1/6 = 0
1/12*x-1/6 = 0 // + 1/6
1/12*x = 1/6 // : 1/12
x = 1/6/1/12
x = 2
x = 2
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