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(4a+18)=58
We move all terms to the left:
(4a+18)-(58)=0
We get rid of parentheses
4a+18-58=0
We add all the numbers together, and all the variables
4a-40=0
We move all terms containing a to the left, all other terms to the right
4a=40
a=40/4
a=10
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