7(21-x)=12

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Solution for 7(21-x)=12 equation: 



7(21-x)=12

We move all terms to the left:

7(21-x)-(12)=0

We add all the numbers together, and all the variables

7(-1x+21)-12=0

We multiply parentheses

-7x+147-12=0

We add all the numbers together, and all the variables

-7x+135=0

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

-7x=-135

x=-135/-7

x=19+2/7

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