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n in (-oo:+oo)
6*(-(7*n)-3) = -18 // + 18
6*(-(7*n)-3)+18 = 0
6*(-7*n-3)+18 = 0
6*(-7*n-3)+18 = 0
-42*n = 0
-42*n = 0
-42*n = 0 // : -42
n = 0
n = 0
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