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3=51-a
We move all terms to the left:
3-(51-a)=0
We add all the numbers together, and all the variables
-(-1a+51)+3=0
We get rid of parentheses
1a-51+3=0
We add all the numbers together, and all the variables
a-48=0
We move all terms containing a to the left, all other terms to the right
a=48
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