21/4.2=x

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Solution for 21/4.2=x equation: 



21/4.2=x

We move all terms to the left:

21/4.2-(x)=0

We add all the numbers together, and all the variables

-1x+5=0

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

-x=-5

x=-5/-1

x=+5

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