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n in (-oo:+oo)
-n-(2*n)-7 = 26 // - 26
-n-(2*n)-26-7 = 0
-n-2*n-26-7 = 0
-3*n-33 = 0 // + 33
-3*n = 33 // : -3
n = 33/(-3)
n = -11
n = -11
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