r=20-3r

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Solution for r=20-3r equation: 


Simplifying
r = 20 + -3r

Solving
r = 20 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
r + 3r = 20 + -3r + 3r

Combine like terms: r + 3r = 4r
4r = 20 + -3r + 3r

Combine like terms: -3r + 3r = 0
4r = 20 + 0
4r = 20

Divide each side by '4'.
r = 5

Simplifying
r = 5

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