7a-15=5a-21

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Solution for 7a-15=5a-21 equation: 



7a-15=5a-21

We move all terms to the left:

7a-15-(5a-21)=0

We get rid of parentheses

7a-5a+21-15=0

We add all the numbers together, and all the variables

2a+6=0

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

2a=-6

a=-6/2

a=-3

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