21+3(-3)=x

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Solution for 21+3(-3)=x equation: 



21+3(-3)=x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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