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9a+10(6a-1)=128
We move all terms to the left:
9a+10(6a-1)-(128)=0
We multiply parentheses
9a+60a-10-128=0
We add all the numbers together, and all the variables
69a-138=0
We move all terms containing a to the left, all other terms to the right
69a=138
a=138/69
a=2
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