2r=30-r

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Solution for 2r=30-r equation: 


Simplifying
2r = 30 + -1r

Solving
2r = 30 + -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.
2r + r = 30 + -1r + r

Combine like terms: 2r + r = 3r
3r = 30 + -1r + r

Combine like terms: -1r + r = 0
3r = 30 + 0
3r = 30

Divide each side by '3'.
r = 10

Simplifying
r = 10

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