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x in (-oo:+oo)
3*x-(3/4) = 12 // - 12
3*x-(3/4)-12 = 0
3*x-3/4-12 = 0
3*x-51/4 = 0 // + 51/4
3*x = 51/4 // : 3
x = 51/4/3
x = 17/4
x = 17/4
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