4r-9r=20

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Solution for 4r-9r=20 equation: 


Simplifying
4r + -9r = 20

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

Solving
-5r = 20

Solving for variable 'r'.

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

Divide each side by '-5'.
r = -4

Simplifying
r = -4

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