105=-5(4-5n)

Solution for 105=-5(4-5n) equation:

Simplifying
105 = -5(4 + -5n)
105 = (4 * -5 + -5n * -5)
105 = (-20 + 25n)

Solving
105 = -20 + 25n

Solving for variable 'n'.

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

Add '-25n' to each side of the equation.
105 + -25n = -20 + 25n + -25n

Combine like terms: 25n + -25n = 0
105 + -25n = -20 + 0
105 + -25n = -20

Add '-105' to each side of the equation.
105 + -105 + -25n = -20 + -105

Combine like terms: 105 + -105 = 0
0 + -25n = -20 + -105
-25n = -20 + -105

Combine like terms: -20 + -105 = -125
-25n = -125

Divide each side by '-25'.
n = 5

Simplifying
n = 5