-20=-5+8(r+9)

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Solution for -20=-5+8(r+9) equation:


Simplifying
-20 = -5 + 8(r + 9)

Reorder the terms:
-20 = -5 + 8(9 + r)
-20 = -5 + (9 * 8 + r * 8)
-20 = -5 + (72 + 8r)

Combine like terms: -5 + 72 = 67
-20 = 67 + 8r

Solving
-20 = 67 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
-20 + -8r = 67 + 8r + -8r

Combine like terms: 8r + -8r = 0
-20 + -8r = 67 + 0
-20 + -8r = 67

Add '20' to each side of the equation.
-20 + 20 + -8r = 67 + 20

Combine like terms: -20 + 20 = 0
0 + -8r = 67 + 20
-8r = 67 + 20

Combine like terms: 67 + 20 = 87
-8r = 87

Divide each side by '-8'.
r = -10.875

Simplifying
r = -10.875

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