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3x+4-x=7-4
We move all terms to the left:
3x+4-x-(7-4)=0
We add all the numbers together, and all the variables
3x-x+4-3=0
We add all the numbers together, and all the variables
2x+1=0
We move all terms containing x to the left, all other terms to the right
2x=-1
x=-1/2
x=-1/2
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