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