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X+2X+3-(X+5)=20
We move all terms to the left:
X+2X+3-(X+5)-(20)=0
We add all the numbers together, and all the variables
3X-(X+5)-17=0
We get rid of parentheses
3X-X-5-17=0
We add all the numbers together, and all the variables
2X-22=0
We move all terms containing X to the left, all other terms to the right
2X=22
X=22/2
X=11
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