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3a+4=2(7-a)
We move all terms to the left:
3a+4-(2(7-a))=0
We add all the numbers together, and all the variables
3a-(2(-1a+7))+4=0
We calculate terms in parentheses: -(2(-1a+7)), so:We get rid of parentheses
2(-1a+7)
We multiply parentheses
-2a+14
Back to the equation:
-(-2a+14)
3a+2a-14+4=0
We add all the numbers together, and all the variables
5a-10=0
We move all terms containing a to the left, all other terms to the right
5a=10
a=10/5
a=2
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