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