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x in (-oo:+oo)
x/3-(x/4) = 7/4 // - 7/4
x/3-(x/4)-(7/4) = 0
x/3-(x/4)-7/4 = 0
1/12*x-7/4 = 0 // + 7/4
1/12*x = 7/4 // : 1/12
x = 7/4/1/12
x = 21
x = 21
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