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x in (-oo:+oo)
x/12 = 3/7 // - 3/7
x/12-(3/7) = 0
x/12-3/7 = 0
1/12*x-3/7 = 0 // + 3/7
1/12*x = 3/7 // : 1/12
x = 3/7/1/12
x = 36/7
x = 36/7
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