3(x+2(1-5x))=-21

Solution for 3(x+2(1-5x))=-21 equation:

Simplifying
3(x + 2(1 + -5x)) = -21
3(x + (1 * 2 + -5x * 2)) = -21
3(x + (2 + -10x)) = -21

Reorder the terms:
3(2 + x + -10x) = -21

Combine like terms: x + -10x = -9x
3(2 + -9x) = -21
(2 * 3 + -9x * 3) = -21
(6 + -27x) = -21

Solving
6 + -27x = -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 + -27x = -21 + -6

Combine like terms: 6 + -6 = 0
0 + -27x = -21 + -6
-27x = -21 + -6

Combine like terms: -21 + -6 = -27
-27x = -27

Divide each side by '-27'.
x = 1

Simplifying
x = 1