-7x-21=42

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Solution for -7x-21=42 equation: 



-7x-21=42

We move all terms to the left:

-7x-21-(42)=0

We add all the numbers together, and all the variables

-7x-63=0

We move all terms containing x to the left, all other terms to the right

-7x=63

x=63/-7

x=-9

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