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7x-3x=28-4x.x
We move all terms to the left:
7x-3x-(28-4x.x)=0
We add all the numbers together, and all the variables
7x-3x-(-4x.x+28)=0
We add all the numbers together, and all the variables
4x-(-4x.x+28)=0
We get rid of parentheses
4x+4x.x-28=0
We move all terms containing x to the left, all other terms to the right
4x+4x.x=28
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