7+2x=2(-x+4)-21

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Solution for 7+2x=2(-x+4)-21 equation: 



7+2x=2(-x+4)-21

We move all terms to the left:

7+2x-(2(-x+4)-21)=0

We add all the numbers together, and all the variables

2x-(2(-1x+4)-21)+7=0



We calculate terms in parentheses: -(2(-1x+4)-21), so:

2(-1x+4)-21

We multiply parentheses

-2x+8-21

We add all the numbers together, and all the variables

-2x-13

Back to the equation:

-(-2x-13)



We get rid of parentheses

2x+2x+13+7=0

We add all the numbers together, and all the variables

4x+20=0

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

4x=-20

x=-20/4

x=-5

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