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-13x-99=-5x+69
We move all terms to the left:
-13x-99-(-5x+69)=0
We get rid of parentheses
-13x+5x-69-99=0
We add all the numbers together, and all the variables
-8x-168=0
We move all terms containing x to the left, all other terms to the right
-8x=168
x=168/-8
x=-21
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