(4-w)(5w-1)=0

Solution for (4-w)(5w-1)=0 equation:

Simplifying
(4 + -1w)(5w + -1) = 0

Reorder the terms:
(4 + -1w)(-1 + 5w) = 0

Multiply (4 + -1w) * (-1 + 5w)
(4(-1 + 5w) + -1w * (-1 + 5w)) = 0
((-1 * 4 + 5w * 4) + -1w * (-1 + 5w)) = 0
((-4 + 20w) + -1w * (-1 + 5w)) = 0
(-4 + 20w + (-1 * -1w + 5w * -1w)) = 0
(-4 + 20w + (1w + -5w2)) = 0

Combine like terms: 20w + 1w = 21w
(-4 + 21w + -5w2) = 0

Solving
-4 + 21w + -5w2 = 0

Solving for variable 'w'.

Factor a trinomial.
(-4 + w)(1 + -5w) = 0

Subproblem 1
Set the factor '(-4 + w)' equal to zero and attempt to solve:

Simplifying
-4 + w = 0

Solving
-4 + w = 0

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

Add '4' to each side of the equation.
-4 + 4 + w = 0 + 4

Combine like terms: -4 + 4 = 0
0 + w = 0 + 4
w = 0 + 4

Combine like terms: 0 + 4 = 4
w = 4

Simplifying
w = 4
Subproblem 2
Set the factor '(1 + -5w)' equal to zero and attempt to solve:

Simplifying
1 + -5w = 0

Solving
1 + -5w = 0

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

Add '-1' to each side of the equation.
1 + -1 + -5w = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -5w = 0 + -1
-5w = 0 + -1

Combine like terms: 0 + -1 = -1
-5w = -1

Divide each side by '-5'.
w = 0.2

Simplifying
w = 0.2
Solution
w = {4, 0.2}