(2x+5)(x+1)=20

Solution for (2x+5)(x+1)=20 equation:

Simplifying
(2x + 5)(x + 1) = 20

Reorder the terms:
(5 + 2x)(x + 1) = 20

Reorder the terms:
(5 + 2x)(1 + x) = 20

Multiply (5 + 2x) * (1 + x)
(5(1 + x) + 2x * (1 + x)) = 20
((1 * 5 + x * 5) + 2x * (1 + x)) = 20
((5 + 5x) + 2x * (1 + x)) = 20
(5 + 5x + (1 * 2x + x * 2x)) = 20
(5 + 5x + (2x + 2x2)) = 20

Combine like terms: 5x + 2x = 7x
(5 + 7x + 2x2) = 20

Solving
5 + 7x + 2x2 = 20

Solving for variable 'x'.

Reorder the terms:
5 + -20 + 7x + 2x2 = 20 + -20

Combine like terms: 5 + -20 = -15
-15 + 7x + 2x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-15 + 7x + 2x2 = 0

Factor a trinomial.
(-5 + -1x)(3 + -2x) = 0

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

Simplifying
-5 + -1x = 0

Solving
-5 + -1x = 0

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

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

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

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

Divide each side by '-1'.
x = -5

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

Simplifying
3 + -2x = 0

Solving
3 + -2x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -2x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -2x = 0 + -3
-2x = 0 + -3

Combine like terms: 0 + -3 = -3
-2x = -3

Divide each side by '-2'.
x = 1.5

Simplifying
x = 1.5
Solution
x = {-5, 1.5}