-8x-21=-20x-87

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Solution for -8x-21=-20x-87 equation: 



-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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