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4+5x=4-7x
We move all terms to the left:
4+5x-(4-7x)=0
We add all the numbers together, and all the variables
5x-(-7x+4)+4=0
We get rid of parentheses
5x+7x-4+4=0
We add all the numbers together, and all the variables
12x=0
x=0/12
x=0
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