3a+7-5a=6a-21

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Solution for 3a+7-5a=6a-21 equation: 



3a+7-5a=6a-21

We move all terms to the left:

3a+7-5a-(6a-21)=0

We add all the numbers together, and all the variables

-2a-(6a-21)+7=0

We get rid of parentheses

-2a-6a+21+7=0

We add all the numbers together, and all the variables

-8a+28=0

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

-8a=-28

a=-28/-8

a=3+1/2

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