80=-4(1+5n)+4(1-5n)

Solution for 80=-4(1+5n)+4(1-5n) equation:

Simplifying
80 = -4(1 + 5n) + 4(1 + -5n)
80 = (1 * -4 + 5n * -4) + 4(1 + -5n)
80 = (-4 + -20n) + 4(1 + -5n)
80 = -4 + -20n + (1 * 4 + -5n * 4)
80 = -4 + -20n + (4 + -20n)

Reorder the terms:
80 = -4 + 4 + -20n + -20n

Combine like terms: -4 + 4 = 0
80 = 0 + -20n + -20n
80 = -20n + -20n

Combine like terms: -20n + -20n = -40n
80 = -40n

Solving
80 = -40n

Solving for variable 'n'.

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

Add '40n' to each side of the equation.
80 + 40n = -40n + 40n

Combine like terms: -40n + 40n = 0
80 + 40n = 0

Add '-80' to each side of the equation.
80 + -80 + 40n = 0 + -80

Combine like terms: 80 + -80 = 0
0 + 40n = 0 + -80
40n = 0 + -80

Combine like terms: 0 + -80 = -80
40n = -80

Divide each side by '40'.
n = -2

Simplifying
n = -2