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3x+x=412.000
We move all terms to the left:
3x+x-(412.000)=0
We add all the numbers together, and all the variables
3x+x-412=0
We add all the numbers together, and all the variables
4x-412=0
We move all terms containing x to the left, all other terms to the right
4x=412
x=412/4
x=103
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