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x in (-oo:+oo)
3*(x-4) = 108/12 // - 108/12
3*(x-4)-(108/12) = 0
3*(x-4)-9 = 0
3*(x-4)-9 = 0
3*x-21 = 0
3*x-21 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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