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18a-(9a/2)=18
We move all terms to the left:
18a-(9a/2)-(18)=0
We add all the numbers together, and all the variables
18a-(+9a/2)-18=0
We get rid of parentheses
18a-9a/2-18=0
We multiply all the terms by the denominator
18a*2-9a-18*2=0
We add all the numbers together, and all the variables
-9a+18a*2-36=0
Wy multiply elements
-9a+36a-36=0
We add all the numbers together, and all the variables
27a-36=0
We move all terms containing a to the left, all other terms to the right
27a=36
a=36/27
a=1+1/3
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