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(16-a)-3=-57
We move all terms to the left:
(16-a)-3-(-57)=0
We add all the numbers together, and all the variables
(-1a+16)-3-(-57)=0
We add all the numbers together, and all the variables
(-1a+16)+54=0
We get rid of parentheses
-1a+16+54=0
We add all the numbers together, and all the variables
-1a+70=0
We move all terms containing a to the left, all other terms to the right
-a=-70
a=-70/-1
a=+70
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