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-4(-4a-1)=100
We move all terms to the left:
-4(-4a-1)-(100)=0
We multiply parentheses
16a+4-100=0
We add all the numbers together, and all the variables
16a-96=0
We move all terms containing a to the left, all other terms to the right
16a=96
a=96/16
a=6
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