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1099=150+6.5a
We move all terms to the left:
1099-(150+6.5a)=0
We add all the numbers together, and all the variables
-(6.5a+150)+1099=0
We get rid of parentheses
-6.5a-150+1099=0
We add all the numbers together, and all the variables
-6.5a+949=0
We move all terms containing a to the left, all other terms to the right
-6.5a=-949
a=-949/-6.5
a=+146
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