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-10a+3(2a+1)=-13-2a
We move all terms to the left:
-10a+3(2a+1)-(-13-2a)=0
We add all the numbers together, and all the variables
-10a+3(2a+1)-(-2a-13)=0
We multiply parentheses
-10a+6a-(-2a-13)+3=0
We get rid of parentheses
-10a+6a+2a+13+3=0
We add all the numbers together, and all the variables
-2a+16=0
We move all terms containing a to the left, all other terms to the right
-2a=-16
a=-16/-2
a=+8
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