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5x-(3+4x)=
We move all terms to the left:
5x-(3+4x)-()=0
We add all the numbers together, and all the variables
5x-(4x+3)-()=0
We add all the numbers together, and all the variables
5x-(4x+3)=0
We get rid of parentheses
5x-4x-3=0
We add all the numbers together, and all the variables
x-3=0
We move all terms containing x to the left, all other terms to the right
x=3
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