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-8x-21=-20x-87
We move all terms to the left:
-8x-21-(-20x-87)=0
We get rid of parentheses
-8x+20x+87-21=0
We add all the numbers together, and all the variables
12x+66=0
We move all terms containing x to the left, all other terms to the right
12x=-66
x=-66/12
x=-5+1/2
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