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-2.5+(-1x)=-13.5
We move all terms to the left:
-2.5+(-1x)-(-13.5)=0
We add all the numbers together, and all the variables
(-1x)+11=0
We get rid of parentheses
-1x+11=0
We move all terms containing x to the left, all other terms to the right
-x=-11
x=-11/-1
x=+11
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