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8(2a+5)=
We move all terms to the left:
8(2a+5)-()=0
We add all the numbers together, and all the variables
8(2a+5)=0
We multiply parentheses
16a+40=0
We move all terms containing a to the left, all other terms to the right
16a=-40
a=-40/16
a=-2+1/2
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