x(-21)=-3

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



x(-21)=-3

We move all terms to the left:

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

We add all the numbers together, and all the variables

x(-21)+3=0

We multiply parentheses

-21x+3=0

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

-21x=-3

x=-3/-21

x=1/7

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