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4(a-+)=-20
We move all terms to the left:
4(a-+)-(-20)=0
We add all the numbers together, and all the variables
4(+a)-(-20)=0
We add all the numbers together, and all the variables
4(+a)+20=0
We multiply parentheses
4a+20=0
We move all terms containing a to the left, all other terms to the right
4a=-20
a=-20/4
a=-5
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