r+20=9r-4

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Solution for r+20=9r-4 equation:


Simplifying
r + 20 = 9r + -4

Reorder the terms:
20 + r = 9r + -4

Reorder the terms:
20 + r = -4 + 9r

Solving
20 + r = -4 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
20 + r + -9r = -4 + 9r + -9r

Combine like terms: r + -9r = -8r
20 + -8r = -4 + 9r + -9r

Combine like terms: 9r + -9r = 0
20 + -8r = -4 + 0
20 + -8r = -4

Add '-20' to each side of the equation.
20 + -20 + -8r = -4 + -20

Combine like terms: 20 + -20 = 0
0 + -8r = -4 + -20
-8r = -4 + -20

Combine like terms: -4 + -20 = -24
-8r = -24

Divide each side by '-8'.
r = 3

Simplifying
r = 3

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