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X-(2.5X)=10
We move all terms to the left:
X-(2.5X)-(10)=0
We add all the numbers together, and all the variables
X-(+2.5X)-10=0
We get rid of parentheses
X-2.5X-10=0
We add all the numbers together, and all the variables
-1.5X-10=0
We move all terms containing X to the left, all other terms to the right
-1.5X=10
X=10/-1.5
X=-6+1/1.5
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