9r=20-r

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Solution for 9r=20-r equation:


Simplifying
9r = 20 + -1r

Solving
9r = 20 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
9r + r = 20 + -1r + r

Combine like terms: 9r + r = 10r
10r = 20 + -1r + r

Combine like terms: -1r + r = 0
10r = 20 + 0
10r = 20

Divide each side by '10'.
r = 2

Simplifying
r = 2

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