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n in (-oo:+oo)
2*n-(7*n)+1 = 36 // - 36
2*n-(7*n)-36+1 = 0
2*n-7*n-36+1 = 0
-5*n-35 = 0 // + 35
-5*n = 35 // : -5
n = 35/(-5)
n = -7
n = -7
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