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