3(6)-21=x

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Solution for 3(6)-21=x equation: 



3(6)-21=x

We move all terms to the left:

3(6)-21-(x)=0

We add all the numbers together, and all the variables

-1x+15=0

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

-x=-15

x=-15/-1

x=+15

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