21-2x=7-9x

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Solution for 21-2x=7-9x equation: 



21-2x=7-9x

We move all terms to the left:

21-2x-(7-9x)=0

We add all the numbers together, and all the variables

-2x-(-9x+7)+21=0

We get rid of parentheses

-2x+9x-7+21=0

We add all the numbers together, and all the variables

7x+14=0

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

7x=-14

x=-14/7

x=-2

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