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x in (-oo:+oo)
x/3 = 39/12 // - 39/12
x/3-(39/12) = 0
x/3-13/4 = 0
1/3*x-13/4 = 0 // + 13/4
1/3*x = 13/4 // : 1/3
x = 13/4/1/3
x = 39/4
x = 39/4
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