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7(x-1)-3.5x=2.5x+
We move all terms to the left:
7(x-1)-3.5x-(2.5x+)=0
We add all the numbers together, and all the variables
7(x-1)-3.5x-(+2.5x)=0
We add all the numbers together, and all the variables
-3.5x+7(x-1)-(+2.5x)=0
We multiply parentheses
-3.5x+7x-(+2.5x)-7=0
We get rid of parentheses
-3.5x+7x-2.5x-7=0
We add all the numbers together, and all the variables
x-7=0
We move all terms containing x to the left, all other terms to the right
x=7
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