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19a-6(a-6)=66
We move all terms to the left:
19a-6(a-6)-(66)=0
We multiply parentheses
19a-6a+36-66=0
We add all the numbers together, and all the variables
13a-30=0
We move all terms containing a to the left, all other terms to the right
13a=30
a=30/13
a=2+4/13
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