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2(11a-6)-4(9-9a)=68
We move all terms to the left:
2(11a-6)-4(9-9a)-(68)=0
We add all the numbers together, and all the variables
2(11a-6)-4(-9a+9)-68=0
We multiply parentheses
22a+36a-12-36-68=0
We add all the numbers together, and all the variables
58a-116=0
We move all terms containing a to the left, all other terms to the right
58a=116
a=116/58
a=2
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