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x in (-oo:+oo)
12*x = 64/12 // - 64/12
12*x-(64/12) = 0
12*x-16/3 = 0
12*x-16/3 = 0 // + 16/3
12*x = 16/3 // : 12
x = 16/3/12
x = 4/9
x = 4/9
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