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-8(-4+a)-(2a+1)=-19
We move all terms to the left:
-8(-4+a)-(2a+1)-(-19)=0
We add all the numbers together, and all the variables
-8(a-4)-(2a+1)-(-19)=0
We add all the numbers together, and all the variables
-8(a-4)-(2a+1)+19=0
We multiply parentheses
-8a-(2a+1)+32+19=0
We get rid of parentheses
-8a-2a-1+32+19=0
We add all the numbers together, and all the variables
-10a+50=0
We move all terms containing a to the left, all other terms to the right
-10a=-50
a=-50/-10
a=+5
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