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n in (-oo:+oo)
22 = 2*n+2*n+10 // - 2*n+2*n+10
22-(2*n)-(2*n)-10 = 0
22-2*n-2*n-10 = 0
12-4*n = 0 // - 12
-4*n = -12 // : -4
n = -12/(-4)
n = 3
n = 3
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