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n in (-oo:+oo)
(-3/4)*n = 8/9 // - 8/9
(-3/4)*n-(8/9) = 0
(-3/4)*n-8/9 = 0
-3/4*n-8/9 = 0 // + 8/9
-3/4*n = 8/9 // : -3/4
n = 8/9/(-3/4)
n = -32/27
n = -32/27
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