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