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