21=3o-4o

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Solution for 21=3o-4o equation: 



21=3o-4o

We move all terms to the left:

21-(3o-4o)=0

We add all the numbers together, and all the variables

-(-1o)+21=0

We get rid of parentheses

1o+21=0

We add all the numbers together, and all the variables

o+21=0

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

o=-21

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