15=x(3+21)

Solution for 15=x(3+21) equation:

Simplifying
15 = x(3 + 21)

Combine like terms: 3 + 21 = 24
15 = x(24)

Reorder the terms for easier multiplication:
15 = 24x

Solving
15 = 24x

Solving for variable 'x'.

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

Add '-24x' to each side of the equation.
15 + -24x = 24x + -24x

Combine like terms: 24x + -24x = 0
15 + -24x = 0

Add '-15' to each side of the equation.
15 + -15 + -24x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -24x = 0 + -15
-24x = 0 + -15

Combine like terms: 0 + -15 = -15
-24x = -15

Divide each side by '-24'.
x = 0.625

Simplifying
x = 0.625