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