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-x-15=-2x-11
We move all terms to the left:
-x-15-(-2x-11)=0
We add all the numbers together, and all the variables
-1x-(-2x-11)-15=0
We get rid of parentheses
-1x+2x+11-15=0
We add all the numbers together, and all the variables
x-4=0
We move all terms containing x to the left, all other terms to the right
x=4
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