9r-45=4r+20

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Solution for 9r-45=4r+20 equation:


Simplifying
9r + -45 = 4r + 20

Reorder the terms:
-45 + 9r = 4r + 20

Reorder the terms:
-45 + 9r = 20 + 4r

Solving
-45 + 9r = 20 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-45 + 9r + -4r = 20 + 4r + -4r

Combine like terms: 9r + -4r = 5r
-45 + 5r = 20 + 4r + -4r

Combine like terms: 4r + -4r = 0
-45 + 5r = 20 + 0
-45 + 5r = 20

Add '45' to each side of the equation.
-45 + 45 + 5r = 20 + 45

Combine like terms: -45 + 45 = 0
0 + 5r = 20 + 45
5r = 20 + 45

Combine like terms: 20 + 45 = 65
5r = 65

Divide each side by '5'.
r = 13

Simplifying
r = 13

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