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2a+3a+4a=5a+18
We move all terms to the left:
2a+3a+4a-(5a+18)=0
We add all the numbers together, and all the variables
9a-(5a+18)=0
We get rid of parentheses
9a-5a-18=0
We add all the numbers together, and all the variables
4a-18=0
We move all terms containing a to the left, all other terms to the right
4a=18
a=18/4
a=4+1/2
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