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(x+3)+x=48
We move all terms to the left:
(x+3)+x-(48)=0
We add all the numbers together, and all the variables
x+(x+3)-48=0
We get rid of parentheses
x+x+3-48=0
We add all the numbers together, and all the variables
2x-45=0
We move all terms containing x to the left, all other terms to the right
2x=45
x=45/2
x=22+1/2
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