15=x*21

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Solution for 15=x*21 equation: 



15=x*21

We move all terms to the left:

15-(x*21)=0

We add all the numbers together, and all the variables

-(+x*21)+15=0

We get rid of parentheses

-x*21+15=0

Wy multiply elements

-21x+15=0

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

-21x=-15

x=-15/-21

x=5/7

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