(5r+1)(4)=

Solution for (5r+1)(4)= equation:

Simplifying
(5r + 1)(4) = 0

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

Reorder the terms for easier multiplication:
4(1 + 5r) = 0
(1 * 4 + 5r * 4) = 0
(4 + 20r) = 0

Solving
4 + 20r = 0

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + 20r = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 20r = 0 + -4
20r = 0 + -4

Combine like terms: 0 + -4 = -4
20r = -4

Divide each side by '20'.
r = -0.2

Simplifying
r = -0.2