2x(6x-1)+21=8x-x(3-12x)

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Solution for 2x(6x-1)+21=8x-x(3-12x) equation:


Simplifying
2x(6x + -1) + 21 = 8x + -1x(3 + -12x)

Reorder the terms:
2x(-1 + 6x) + 21 = 8x + -1x(3 + -12x)
(-1 * 2x + 6x * 2x) + 21 = 8x + -1x(3 + -12x)
(-2x + 12x2) + 21 = 8x + -1x(3 + -12x)

Reorder the terms:
21 + -2x + 12x2 = 8x + -1x(3 + -12x)
21 + -2x + 12x2 = 8x + (3 * -1x + -12x * -1x)
21 + -2x + 12x2 = 8x + (-3x + 12x2)

Combine like terms: 8x + -3x = 5x
21 + -2x + 12x2 = 5x + 12x2

Add '-12x2' to each side of the equation.
21 + -2x + 12x2 + -12x2 = 5x + 12x2 + -12x2

Combine like terms: 12x2 + -12x2 = 0
21 + -2x + 0 = 5x + 12x2 + -12x2
21 + -2x = 5x + 12x2 + -12x2

Combine like terms: 12x2 + -12x2 = 0
21 + -2x = 5x + 0
21 + -2x = 5x

Solving
21 + -2x = 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
21 + -2x + -5x = 5x + -5x

Combine like terms: -2x + -5x = -7x
21 + -7x = 5x + -5x

Combine like terms: 5x + -5x = 0
21 + -7x = 0

Add '-21' to each side of the equation.
21 + -21 + -7x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -7x = 0 + -21
-7x = 0 + -21

Combine like terms: 0 + -21 = -21
-7x = -21

Divide each side by '-7'.
x = 3

Simplifying
x = 3

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