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4x+7x=+5x=128
We move all terms to the left:
4x+7x-(+5x)=0
We add all the numbers together, and all the variables
11x-(+5x)=0
We get rid of parentheses
11x-5x=0
We add all the numbers together, and all the variables
6x=0
x=0/6
x=0
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