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