9*10-42=x

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Solution for 9*10-42=x equation: 



9*10-42=x

We move all terms to the left:

9*10-42-(x)=0

We add all the numbers together, and all the variables

-1x+48=0

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

-x=-48

x=-48/-1

x=+48

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