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35=-7a+2a
We move all terms to the left:
35-(-7a+2a)=0
We add all the numbers together, and all the variables
-(-5a)+35=0
We get rid of parentheses
5a+35=0
We move all terms containing a to the left, all other terms to the right
5a=-35
a=-35/5
a=-7
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