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n in (-oo:+oo)
2*(2-(7*n)) = 18 // - 18
2*(2-(7*n))-18 = 0
2*(2-7*n)-18 = 0
2*(2-7*n)-18 = 0
-14*n-14 = 0
-14*n-14 = 0
-14*n-14 = 0 // + 14
-14*n = 14 // : -14
n = 14/(-14)
n = -1
n = -1
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