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n in (-oo:+oo)
2*(-(7*n)-5) = -136 // + 136
2*(-(7*n)-5)+136 = 0
2*(-7*n-5)+136 = 0
2*(-7*n-5)+136 = 0
126-14*n = 0
126-14*n = 0
126-14*n = 0 // - 126
-14*n = -126 // : -14
n = -126/(-14)
n = 9
n = 9
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