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n in (-oo:+oo)
7*(-(3*n)-5) = 133 // - 133
7*(-(3*n)-5)-133 = 0
7*(-3*n-5)-133 = 0
7*(-3*n-5)-133 = 0
-21*n-168 = 0
-21*n-168 = 0
-21*n-168 = 0 // + 168
-21*n = 168 // : -21
n = 168/(-21)
n = -8
n = -8
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