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180=51+103+a
We move all terms to the left:
180-(51+103+a)=0
We add all the numbers together, and all the variables
-(a+154)+180=0
We get rid of parentheses
-a-154+180=0
We add all the numbers together, and all the variables
-1a+26=0
We move all terms containing a to the left, all other terms to the right
-a=-26
a=-26/-1
a=+26
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