9r=4r-40

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Solution for 9r=4r-40 equation: 


Simplifying
9r = 4r + -40

Reorder the terms:
9r = -40 + 4r

Solving
9r = -40 + 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.
9r + -4r = -40 + 4r + -4r

Combine like terms: 9r + -4r = 5r
5r = -40 + 4r + -4r

Combine like terms: 4r + -4r = 0
5r = -40 + 0
5r = -40

Divide each side by '5'.
r = -8

Simplifying
r = -8

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