21-3x=-7-10x=x=

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Solution for 21-3x=-7-10x=x= equation: 



21-3x=-7-10x=x=

We move all terms to the left:

21-3x-(-7-10x)=0

We add all the numbers together, and all the variables

-3x-(-10x-7)+21=0

We get rid of parentheses

-3x+10x+7+21=0

We add all the numbers together, and all the variables

7x+28=0

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

7x=-28

x=-28/7

x=-4

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