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3.5x=x+x+x-2.5+x-2.5
We move all terms to the left:
3.5x-(x+x+x-2.5+x-2.5)=0
We add all the numbers together, and all the variables
3.5x-(4x-5)=0
We get rid of parentheses
3.5x-4x+5=0
We add all the numbers together, and all the variables
-0.5x+5=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-5
x=-5/-0.5
x=+10
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