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-11x-15=-9-13x
We move all terms to the left:
-11x-15-(-9-13x)=0
We add all the numbers together, and all the variables
-11x-(-13x-9)-15=0
We get rid of parentheses
-11x+13x+9-15=0
We add all the numbers together, and all the variables
2x-6=0
We move all terms containing x to the left, all other terms to the right
2x=6
x=6/2
x=3
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