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5(-2a-4)+10a=-20
We move all terms to the left:
5(-2a-4)+10a-(-20)=0
We add all the numbers together, and all the variables
10a+5(-2a-4)+20=0
We multiply parentheses
10a-10a-20+20=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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