-6+3(1-5x)=21

Solution for -6+3(1-5x)=21 equation:

Simplifying
-6 + 3(1 + -5x) = 21
-6 + (1 * 3 + -5x * 3) = 21
-6 + (3 + -15x) = 21

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

Solving
-3 + -15x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + -15x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + -15x = 21 + 3
-15x = 21 + 3

Combine like terms: 21 + 3 = 24
-15x = 24

Divide each side by '-15'.
x = -1.6

Simplifying
x = -1.6