-21=-x/3-18

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Solution for -21=-x/3-18 equation: 



-21=-x/3-18

We move all terms to the left:

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

We get rid of parentheses

x/3+18-21=0

We multiply all the terms by the denominator


x+18*3-21*3=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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