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5a-2(-7a-10)=128
We move all terms to the left:
5a-2(-7a-10)-(128)=0
We multiply parentheses
5a+14a+20-128=0
We add all the numbers together, and all the variables
19a-108=0
We move all terms containing a to the left, all other terms to the right
19a=108
a=108/19
a=5+13/19
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