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x in (-oo:+oo)
x/4+x/3 = 9/4 // - 9/4
x/4+x/3-(9/4) = 0
x/4+x/3-9/4 = 0
7/12*x-9/4 = 0 // + 9/4
7/12*x = 9/4 // : 7/12
x = 9/4/7/12
x = 27/7
x = 27/7
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