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x+3+3x=x+10
We move all terms to the left:
x+3+3x-(x+10)=0
We add all the numbers together, and all the variables
4x-(x+10)+3=0
We get rid of parentheses
4x-x-10+3=0
We add all the numbers together, and all the variables
3x-7=0
We move all terms containing x to the left, all other terms to the right
3x=7
x=7/3
x=2+1/3
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