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x in (-oo:+oo)
x/6+(3*x)/4 = 11 // - 11
x/6+(3*x)/4-11 = 0
11/12*x-11 = 0 // + 11
11/12*x = 11 // : 11/12
x = 11/11/12
x = 12
x = 12
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