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-8(-4+a)+3(2a+1)=-9
We move all terms to the left:
-8(-4+a)+3(2a+1)-(-9)=0
We add all the numbers together, and all the variables
-8(a-4)+3(2a+1)-(-9)=0
We add all the numbers together, and all the variables
-8(a-4)+3(2a+1)+9=0
We multiply parentheses
-8a+6a+32+3+9=0
We add all the numbers together, and all the variables
-2a+44=0
We move all terms containing a to the left, all other terms to the right
-2a=-44
a=-44/-2
a=+22
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