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-21=5-8x-5x
We move all terms to the left:
-21-(5-8x-5x)=0
We add all the numbers together, and all the variables
-(-13x+5)-21=0
We get rid of parentheses
13x-5-21=0
We add all the numbers together, and all the variables
13x-26=0
We move all terms containing x to the left, all other terms to the right
13x=26
x=26/13
x=2
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