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

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


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

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

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

Reorder the terms for easier multiplication:
12 + 21x = 3(-1 + 2x)
12 + 21x = (-1 * 3 + 2x * 3)
12 + 21x = (-3 + 6x)

Solving
12 + 21x = -3 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
12 + 21x + -6x = -3 + 6x + -6x

Combine like terms: 21x + -6x = 15x
12 + 15x = -3 + 6x + -6x

Combine like terms: 6x + -6x = 0
12 + 15x = -3 + 0
12 + 15x = -3

Add '-12' to each side of the equation.
12 + -12 + 15x = -3 + -12

Combine like terms: 12 + -12 = 0
0 + 15x = -3 + -12
15x = -3 + -12

Combine like terms: -3 + -12 = -15
15x = -15

Divide each side by '15'.
x = -1

Simplifying
x = -1

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