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(6a+8)+(12a)+(6a+8)+(10a-4)=250
We move all terms to the left:
(6a+8)+(12a)+(6a+8)+(10a-4)-(250)=0
We add all the numbers together, and all the variables
12a+(6a+8)+(6a+8)+(10a-4)-250=0
We get rid of parentheses
12a+6a+6a+10a+8+8-4-250=0
We add all the numbers together, and all the variables
34a-238=0
We move all terms containing a to the left, all other terms to the right
34a=238
a=238/34
a=7
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