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3a=1210-a=
We move all terms to the left:
3a-(1210-a)=0
We add all the numbers together, and all the variables
3a-(-1a+1210)=0
We get rid of parentheses
3a+1a-1210=0
We add all the numbers together, and all the variables
4a-1210=0
We move all terms containing a to the left, all other terms to the right
4a=1210
a=1210/4
a=302+1/2
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