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3x=2123-4x
We move all terms to the left:
3x-(2123-4x)=0
We add all the numbers together, and all the variables
3x-(-4x+2123)=0
We get rid of parentheses
3x+4x-2123=0
We add all the numbers together, and all the variables
7x-2123=0
We move all terms containing x to the left, all other terms to the right
7x=2123
x=2123/7
x=303+2/7
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