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n in (-oo:+oo)
(3/4)*n-((2/3)*n) = 5 // - 5
(3/4)*n-((2/3)*n)-5 = 0
(3/4)*n+(-2/3)*n-5 = 0
1/12*n-5 = 0 // + 5
1/12*n = 5 // : 1/12
n = 5/1/12
n = 60
n = 60
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