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-5a+6(5a+4)=99
We move all terms to the left:
-5a+6(5a+4)-(99)=0
We multiply parentheses
-5a+30a+24-99=0
We add all the numbers together, and all the variables
25a-75=0
We move all terms containing a to the left, all other terms to the right
25a=75
a=75/25
a=3
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