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6a+4(5a-7)=15
We move all terms to the left:
6a+4(5a-7)-(15)=0
We multiply parentheses
6a+20a-28-15=0
We add all the numbers together, and all the variables
26a-43=0
We move all terms containing a to the left, all other terms to the right
26a=43
a=43/26
a=1+17/26
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