-21=3+8x

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Solution for -21=3+8x equation:



-21=3+8x
We move all terms to the left:
-21-(3+8x)=0
We add all the numbers together, and all the variables
-(8x+3)-21=0
We get rid of parentheses
-8x-3-21=0
We add all the numbers together, and all the variables
-8x-24=0
We move all terms containing x to the left, all other terms to the right
-8x=24
x=24/-8
x=-3

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