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-6(1-9a)=18
We move all terms to the left:
-6(1-9a)-(18)=0
We add all the numbers together, and all the variables
-6(-9a+1)-18=0
We multiply parentheses
54a-6-18=0
We add all the numbers together, and all the variables
54a-24=0
We move all terms containing a to the left, all other terms to the right
54a=24
a=24/54
a=4/9
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