-18=x+21+7

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Solution for -18=x+21+7 equation: 



-18=x+21+7

We move all terms to the left:

-18-(x+21+7)=0

We add all the numbers together, and all the variables

-(x+28)-18=0

We get rid of parentheses

-x-28-18=0

We add all the numbers together, and all the variables

-1x-46=0

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

-x=46

x=46/-1

x=-46

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