54=3*7-x

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Solution for 54=3*7-x equation: 



54=3*7-x

We move all terms to the left:

54-(3*7-x)=0

We add all the numbers together, and all the variables

-(-1x+21)+54=0

We get rid of parentheses

1x-21+54=0

We add all the numbers together, and all the variables

x+33=0

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

x=-33

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