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n in (-oo:+oo)
(-2/3)*(9-(12*n))-((2/5)*(20*n-15)) = 0
(-2/3)*(9-12*n)+(-2/5)*(20*n-15) = 0
-2/3*(9-12*n)-2/5*(20*n-15) = 0
-2/3*(9-12*n)-2/5*(20*n-15) = 0
0 = 0
0 = 0
0 = 0
n należy do R
n in (-oo:+oo)
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