3(-3(x-x^2)-4x)=9x^2+21

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Solution for 3(-3(x-x^2)-4x)=9x^2+21 equation: 


Simplifying
3(-3(x + -1x2) + -4x) = 9x2 + 21
3((x * -3 + -1x2 * -3) + -4x) = 9x2 + 21
3((-3x + 3x2) + -4x) = 9x2 + 21

Reorder the terms:
3(-3x + -4x + 3x2) = 9x2 + 21

Combine like terms: -3x + -4x = -7x
3(-7x + 3x2) = 9x2 + 21
(-7x * 3 + 3x2 * 3) = 9x2 + 21
(-21x + 9x2) = 9x2 + 21

Reorder the terms:
-21x + 9x2 = 21 + 9x2

Add '-9x2' to each side of the equation.
-21x + 9x2 + -9x2 = 21 + 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
-21x + 0 = 21 + 9x2 + -9x2
-21x = 21 + 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
-21x = 21 + 0
-21x = 21

Solving
-21x = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '-21'.
x = -1

Simplifying
x = -1

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