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-137=-11a+-38
We move all terms to the left:
-137-(-11a+-38)=0
We add all the numbers together, and all the variables
-(-11a-38)-137=0
We get rid of parentheses
11a+38-137=0
We add all the numbers together, and all the variables
11a-99=0
We move all terms containing a to the left, all other terms to the right
11a=99
a=99/11
a=9
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