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3x+x=10+2
We move all terms to the left:
3x+x-(10+2)=0
We add all the numbers together, and all the variables
3x+x-12=0
We add all the numbers together, and all the variables
4x-12=0
We move all terms containing x to the left, all other terms to the right
4x=12
x=12/4
x=3
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