21x=0.5

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Solution for 21x=0.5 equation: 



21x=0.5

We move all terms to the left:

21x-(0.5)=0

We add all the numbers together, and all the variables

21x-0.5=0

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

21x=0.5

x=0.5/21

x=0.5/21

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