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(a+40)+30=360
We move all terms to the left:
(a+40)+30-(360)=0
We add all the numbers together, and all the variables
(a+40)-330=0
We get rid of parentheses
a+40-330=0
We add all the numbers together, and all the variables
a-290=0
We move all terms containing a to the left, all other terms to the right
a=290
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