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2(-3a+5)=28
We move all terms to the left:
2(-3a+5)-(28)=0
We multiply parentheses
-6a+10-28=0
We add all the numbers together, and all the variables
-6a-18=0
We move all terms containing a to the left, all other terms to the right
-6a=18
a=18/-6
a=-3
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