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4(a+7)+2(a+1)=6a+2a
We move all terms to the left:
4(a+7)+2(a+1)-(6a+2a)=0
We add all the numbers together, and all the variables
4(a+7)+2(a+1)-(+8a)=0
We multiply parentheses
4a+2a-(+8a)+28+2=0
We get rid of parentheses
4a+2a-8a+28+2=0
We add all the numbers together, and all the variables
-2a+30=0
We move all terms containing a to the left, all other terms to the right
-2a=-30
a=-30/-2
a=+15
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