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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