7*x*3=21

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Solution for 7*x*3=21 equation: 



7*x*3=21

We move all terms to the left:

7*x*3-(21)=0

Wy multiply elements

21x*3-21=0

Wy multiply elements

63x-21=0

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

63x=21

x=21/63

x=1/3

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