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-3a+28+8a=5a-7a
We move all terms to the left:
-3a+28+8a-(5a-7a)=0
We add all the numbers together, and all the variables
-3a+8a-(-2a)+28=0
We add all the numbers together, and all the variables
5a-(-2a)+28=0
We get rid of parentheses
5a+2a+28=0
We add all the numbers together, and all the variables
7a+28=0
We move all terms containing a to the left, all other terms to the right
7a=-28
a=-28/7
a=-4
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