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(2x+15)/3+9=20
We move all terms to the left:
(2x+15)/3+9-(20)=0
We add all the numbers together, and all the variables
(2x+15)/3-11=0
We multiply all the terms by the denominator
(2x+15)-11*3=0
We add all the numbers together, and all the variables
(2x+15)-33=0
We get rid of parentheses
2x+15-33=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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