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6(8a+6)-7(5a+3)=54
We move all terms to the left:
6(8a+6)-7(5a+3)-(54)=0
We multiply parentheses
48a-35a+36-21-54=0
We add all the numbers together, and all the variables
13a-39=0
We move all terms containing a to the left, all other terms to the right
13a=39
a=39/13
a=3
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