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42=10+8a
We move all terms to the left:
42-(10+8a)=0
We add all the numbers together, and all the variables
-(8a+10)+42=0
We get rid of parentheses
-8a-10+42=0
We add all the numbers together, and all the variables
-8a+32=0
We move all terms containing a to the left, all other terms to the right
-8a=-32
a=-32/-8
a=+4
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