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3x+7=x+15+20
We move all terms to the left:
3x+7-(x+15+20)=0
We add all the numbers together, and all the variables
3x-(x+35)+7=0
We get rid of parentheses
3x-x-35+7=0
We add all the numbers together, and all the variables
2x-28=0
We move all terms containing x to the left, all other terms to the right
2x=28
x=28/2
x=14
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