2(r+9)-20=

Solution for 2(r+9)-20= equation:

Simplifying
2(r + 9) + -20 = 0

Reorder the terms:
2(9 + r) + -20 = 0
(9 * 2 + r * 2) + -20 = 0
(18 + 2r) + -20 = 0

Reorder the terms:
18 + -20 + 2r = 0

Combine like terms: 18 + -20 = -2
-2 + 2r = 0

Solving
-2 + 2r = 0

Solving for variable 'r'.

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

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

Combine like terms: -2 + 2 = 0
0 + 2r = 0 + 2
2r = 0 + 2

Combine like terms: 0 + 2 = 2
2r = 2

Divide each side by '2'.
r = 1

Simplifying
r = 1