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n in (-oo:+oo)
(-3/4)*(n+33) = n+12 // - n+12
(-3/4)*(n+33)-n-12 = 0
-3/4*(n+33)-n-12 = 0
-3/4*(n+33)-n-12 = 0
-7/4*n-99/4-12 = 0
-7/4*n-147/4 = 0
-7/4*n-147/4 = 0
-7/4*n-147/4 = 0 // + 147/4
-7/4*n = 147/4 // : -7/4
n = 147/4/(-7/4)
n = -21
n = -21
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