3(3+5x)-3=21

Solution for 3(3+5x)-3=21 equation:

Simplifying
3(3 + 5x) + -3 = 21
(3 * 3 + 5x * 3) + -3 = 21
(9 + 15x) + -3 = 21

Reorder the terms:
9 + -3 + 15x = 21

Combine like terms: 9 + -3 = 6
6 + 15x = 21

Solving
6 + 15x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 15x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 15x = 21 + -6
15x = 21 + -6

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

Divide each side by '15'.
x = 1

Simplifying
x = 1