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x in (-oo:+oo)
x/12 = 15/9 // - 15/9
x/12-(15/9) = 0
x/12-5/3 = 0
1/12*x-5/3 = 0 // + 5/3
1/12*x = 5/3 // : 1/12
x = 5/3/1/12
x = 20
x = 20
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