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n in (-oo:+oo)
5-((2/3)*n) = 99 // - 99
5-((2/3)*n)-99 = 0
(-2/3)*n-99+5 = 0
-2/3*n-94 = 0 // + 94
-2/3*n = 94 // : -2/3
n = 94/(-2/3)
n = -141
n = -141
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