18=-3-21x

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Solution for 18=-3-21x equation: 



18=-3-21x

We move all terms to the left:

18-(-3-21x)=0

We add all the numbers together, and all the variables

-(-21x-3)+18=0

We get rid of parentheses

21x+3+18=0

We add all the numbers together, and all the variables

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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