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n in (-oo:+oo)
(-2/3)*n-6 = 18 // - 18
(-2/3)*n-18-6 = 0
-2/3*n-24 = 0 // + 24
-2/3*n = 24 // : -2/3
n = 24/(-2/3)
n = -36
n = -36
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