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16+10=9-28a
We move all terms to the left:
16+10-(9-28a)=0
We add all the numbers together, and all the variables
-(-28a+9)+16+10=0
We add all the numbers together, and all the variables
-(-28a+9)+26=0
We get rid of parentheses
28a-9+26=0
We add all the numbers together, and all the variables
28a+17=0
We move all terms containing a to the left, all other terms to the right
28a=-17
a=-17/28
a=-17/28
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