21=-18+2x

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Solution for 21=-18+2x equation: 



21=-18+2x

We move all terms to the left:

21-(-18+2x)=0

We add all the numbers together, and all the variables

-(2x-18)+21=0

We get rid of parentheses

-2x+18+21=0

We add all the numbers together, and all the variables

-2x+39=0

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

-2x=-39

x=-39/-2

x=19+1/2

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