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x in (-oo:+oo)
(12/4)*x = 27/9 // - 27/9
(12/4)*x-(27/9) = 0
(12/4)*x-3 = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x = 1
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