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3x+28=4+x
We move all terms to the left:
3x+28-(4+x)=0
We add all the numbers together, and all the variables
3x-(x+4)+28=0
We get rid of parentheses
3x-x-4+28=0
We add all the numbers together, and all the variables
2x+24=0
We move all terms containing x to the left, all other terms to the right
2x=-24
x=-24/2
x=-12
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