4r-40=9r

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Solution for 4r-40=9r equation:


Simplifying
4r + -40 = 9r

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

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

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

Combine like terms: 9r + -9r = 0
-40 + -5r = 0

Add '40' to each side of the equation.
-40 + 40 + -5r = 0 + 40

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

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

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

Simplifying
r = -8

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