(N-12)(3n+21)=0

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Solution for (N-12)(3n+21)=0 equation: 



(-12)(3N+21)=0

We multiply parentheses ..

(-36N-252)=0

We get rid of parentheses

-36N-252=0

We move all terms containing N to the left, all other terms to the right

-36N=252

N=252/-36

N=-7

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