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3x+10x=3+x
We move all terms to the left:
3x+10x-(3+x)=0
We add all the numbers together, and all the variables
3x+10x-(x+3)=0
We add all the numbers together, and all the variables
13x-(x+3)=0
We get rid of parentheses
13x-x-3=0
We add all the numbers together, and all the variables
12x-3=0
We move all terms containing x to the left, all other terms to the right
12x=3
x=3/12
x=1/4
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