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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

2x(-1x+4)-21

We multiply parentheses

-2x^2+8x-21

Back to the equation:

-(-2x^2+8x-21)



We get rid of parentheses

2x^2-8x+2x+21+7=0

We add all the numbers together, and all the variables

2x^2-6x+28=0

a = 2; b = -6; c = +28;
Δ = b2-4ac
Δ = -62-4·2·28
Δ = -188
Delta is less than zero, so there is no solution for the equation

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