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5(2a+3)=55
We move all terms to the left:
5(2a+3)-(55)=0
We multiply parentheses
10a+15-55=0
We add all the numbers together, and all the variables
10a-40=0
We move all terms containing a to the left, all other terms to the right
10a=40
a=40/10
a=4
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