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3+10x=7x+39
We move all terms to the left:
3+10x-(7x+39)=0
We get rid of parentheses
10x-7x-39+3=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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