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5a+8a-9a=-2a
We move all terms to the left:
5a+8a-9a-(-2a)=0
We add all the numbers together, and all the variables
4a-(-2a)=0
We get rid of parentheses
4a+2a=0
We add all the numbers together, and all the variables
6a=0
a=0/6
a=0
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