9=4+x/21

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Solution for 9=4+x/21 equation: 



9=4+x/21

We move all terms to the left:

9-(4+x/21)=0

We add all the numbers together, and all the variables

-(x/21+4)+9=0

We get rid of parentheses

-x/21-4+9=0

We multiply all the terms by the denominator


-x-4*21+9*21=0

We add all the numbers together, and all the variables

-1x+105=0

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

-x=-105

x=-105/-1

x=+105

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