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-38=7a-10
We move all terms to the left:
-38-(7a-10)=0
We get rid of parentheses
-7a+10-38=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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