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7-3x=28-4x.x
We move all terms to the left:
7-3x-(28-4x.x)=0
We add all the numbers together, and all the variables
-3x-(-4x.x+28)+7=0
We get rid of parentheses
-3x+4x.x-28+7=0
We add all the numbers together, and all the variables
-3x+4x.x-21=0
We move all terms containing x to the left, all other terms to the right
-3x+4x.x=21
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