5a+7=3a-21

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Solution for 5a+7=3a-21 equation: 



5a+7=3a-21

We move all terms to the left:

5a+7-(3a-21)=0

We get rid of parentheses

5a-3a+21+7=0

We add all the numbers together, and all the variables

2a+28=0

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

2a=-28

a=-28/2

a=-14

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