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n in (-oo:+oo)
7*n-(4*n)+6 = 36 // - 36
7*n-(4*n)-36+6 = 0
7*n-4*n-36+6 = 0
3*n-30 = 0 // + 30
3*n = 30 // : 3
n = 30/3
n = 10
n = 10
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