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10a+5=-8a
We move all terms to the left:
10a+5-(-8a)=0
We get rid of parentheses
10a+8a+5=0
We add all the numbers together, and all the variables
18a+5=0
We move all terms containing a to the left, all other terms to the right
18a=-5
a=-5/18
a=-5/18
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