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a+(a+161650)=316150
We move all terms to the left:
a+(a+161650)-(316150)=0
We get rid of parentheses
a+a+161650-316150=0
We add all the numbers together, and all the variables
2a-154500=0
We move all terms containing a to the left, all other terms to the right
2a=154500
a=154500/2
a=77250
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