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-2.5x-7.5=x+6.5
We move all terms to the left:
-2.5x-7.5-(x+6.5)=0
We get rid of parentheses
-2.5x-x-6.5-7.5=0
We add all the numbers together, and all the variables
-3.5x-14=0
We move all terms containing x to the left, all other terms to the right
-3.5x=14
x=14/-3.5
x=-4
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