30=x+21-18

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Solution for 30=x+21-18 equation: 



30=x+21-18

We move all terms to the left:

30-(x+21-18)=0

We add all the numbers together, and all the variables

-(x+3)+30=0

We get rid of parentheses

-x-3+30=0

We add all the numbers together, and all the variables

-1x+27=0

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

-x=-27

x=-27/-1

x=+27

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