(5r-3)(4r+2r+5)=

Solution for (5r-3)(4r+2r+5)= equation:

Simplifying
(5r + -3)(4r + 2r + 5) = 0

Reorder the terms:
(-3 + 5r)(4r + 2r + 5) = 0

Reorder the terms:
(-3 + 5r)(5 + 4r + 2r) = 0

Combine like terms: 4r + 2r = 6r
(-3 + 5r)(5 + 6r) = 0

Multiply (-3 + 5r) * (5 + 6r)
(-3(5 + 6r) + 5r * (5 + 6r)) = 0
((5 * -3 + 6r * -3) + 5r * (5 + 6r)) = 0
((-15 + -18r) + 5r * (5 + 6r)) = 0
(-15 + -18r + (5 * 5r + 6r * 5r)) = 0
(-15 + -18r + (25r + 30r2)) = 0

Combine like terms: -18r + 25r = 7r
(-15 + 7r + 30r2) = 0

Solving
-15 + 7r + 30r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-5 + -6r)(3 + -5r) = 0

Subproblem 1
Set the factor '(-5 + -6r)' equal to zero and attempt to solve:

Simplifying
-5 + -6r = 0

Solving
-5 + -6r = 0

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

Add '5' to each side of the equation.
-5 + 5 + -6r = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -6r = 0 + 5
-6r = 0 + 5

Combine like terms: 0 + 5 = 5
-6r = 5

Divide each side by '-6'.
r = -0.8333333333

Simplifying
r = -0.8333333333
Subproblem 2
Set the factor '(3 + -5r)' equal to zero and attempt to solve:

Simplifying
3 + -5r = 0

Solving
3 + -5r = 0

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

Add '-3' to each side of the equation.
3 + -3 + -5r = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -5r = 0 + -3
-5r = 0 + -3

Combine like terms: 0 + -3 = -3
-5r = -3

Divide each side by '-5'.
r = 0.6

Simplifying
r = 0.6
Solution
r = {-0.8333333333, 0.6}