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-52=2a-9a+18
We move all terms to the left:
-52-(2a-9a+18)=0
We add all the numbers together, and all the variables
-(-7a+18)-52=0
We get rid of parentheses
7a-18-52=0
We add all the numbers together, and all the variables
7a-70=0
We move all terms containing a to the left, all other terms to the right
7a=70
a=70/7
a=10
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