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9+2.5-13+(-x)=x
We move all terms to the left:
9+2.5-13+(-x)-(x)=0
We add all the numbers together, and all the variables
(-1x)-x+9+2.5-13=0
We add all the numbers together, and all the variables
-1x+(-1x)-1.5=0
We get rid of parentheses
-1x-1x-1.5=0
We add all the numbers together, and all the variables
-2x-1.5=0
We move all terms containing x to the left, all other terms to the right
-2x=1.5
x=1.5/-2
x=-1/1.33333333333
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