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x in (-oo:+oo)
x/12 = 56/84 // - 56/84
x/12-(56/84) = 0
x/12-2/3 = 0
1/12*x-2/3 = 0 // + 2/3
1/12*x = 2/3 // : 1/12
x = 2/3/1/12
x = 8
x = 8
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