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x in (-oo:+oo)
2/3 = x/4+x/3 // - x/4+x/3
2/3-(x/4)-(x/3) = 0
2/3-7/12*x = 0 // - 2/3
-7/12*x = -2/3 // : -7/12
x = -2/3/(-7/12)
x = 8/7
x = 8/7
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