(1+x)3=21x

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

Simplifying
(1 + x) * 3 = 21x

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

Solving
3 + 3x = 21x

Solving for variable 'x'.

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

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

Combine like terms: 3x + -21x = -18x
3 + -18x = 21x + -21x

Combine like terms: 21x + -21x = 0
3 + -18x = 0

Add '-3' to each side of the equation.
3 + -3 + -18x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -18x = 0 + -3
-18x = 0 + -3

Combine like terms: 0 + -3 = -3
-18x = -3

Divide each side by '-18'.
x = 0.1666666667

Simplifying
x = 0.1666666667