-(2n+1)-2(1+5n)=21

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

Simplifying
-1(2n + 1) + -2(1 + 5n) = 21

Reorder the terms:
-1(1 + 2n) + -2(1 + 5n) = 21
(1 * -1 + 2n * -1) + -2(1 + 5n) = 21
(-1 + -2n) + -2(1 + 5n) = 21
-1 + -2n + (1 * -2 + 5n * -2) = 21
-1 + -2n + (-2 + -10n) = 21

Reorder the terms:
-1 + -2 + -2n + -10n = 21

Combine like terms: -1 + -2 = -3
-3 + -2n + -10n = 21

Combine like terms: -2n + -10n = -12n
-3 + -12n = 21

Solving
-3 + -12n = 21

Solving for variable 'n'.

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

Add '3' to each side of the equation.
-3 + 3 + -12n = 21 + 3

Combine like terms: -3 + 3 = 0
0 + -12n = 21 + 3
-12n = 21 + 3

Combine like terms: 21 + 3 = 24
-12n = 24

Divide each side by '-12'.
n = -2

Simplifying
n = -2