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5(2a+3)-2a=55
We move all terms to the left:
5(2a+3)-2a-(55)=0
We add all the numbers together, and all the variables
-2a+5(2a+3)-55=0
We multiply parentheses
-2a+10a+15-55=0
We add all the numbers together, and all the variables
8a-40=0
We move all terms containing a to the left, all other terms to the right
8a=40
a=40/8
a=5
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