3x(-7)=-21

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Solution for 3x(-7)=-21 equation: 



3x(-7)=-21

We move all terms to the left:

3x(-7)-(-21)=0

We add all the numbers together, and all the variables

3x(-7)+21=0

We multiply parentheses

-21x+21=0

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

-21x=-21

x=-21/-21

x=1

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