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a+137=-7a+9
We move all terms to the left:
a+137-(-7a+9)=0
We get rid of parentheses
a+7a-9+137=0
We add all the numbers together, and all the variables
8a+128=0
We move all terms containing a to the left, all other terms to the right
8a=-128
a=-128/8
a=-16
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