7-x=2x+21

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Solution for 7-x=2x+21 equation: 



7-x=2x+21

We move all terms to the left:

7-x-(2x+21)=0

We add all the numbers together, and all the variables

-1x-(2x+21)+7=0

We get rid of parentheses

-1x-2x-21+7=0

We add all the numbers together, and all the variables

-3x-14=0

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

-3x=14

x=14/-3

x=-4+2/3

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