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7=28+3.5x
We move all terms to the left:
7-(28+3.5x)=0
We add all the numbers together, and all the variables
-(3.5x+28)+7=0
We get rid of parentheses
-3.5x-28+7=0
We add all the numbers together, and all the variables
-3.5x-21=0
We move all terms containing x to the left, all other terms to the right
-3.5x=21
x=21/-3.5
x=-6
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