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n in (-oo:+oo)
(2*n)/3-(1/4) = 7/4 // - 7/4
(2*n)/3-(1/4)-(7/4) = 0
(2*n)/3-1/4-7/4 = 0
2/3*n-2 = 0 // + 2
2/3*n = 2 // : 2/3
n = 2/2/3
n = 3
n = 3
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