r=.9r+30

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Solution for r=.9r+30 equation: 


Simplifying
r = 0.9r + 30

Reorder the terms:
r = 30 + 0.9r

Solving
r = 30 + 0.9r

Solving for variable 'r'.

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

Add '-0.9r' to each side of the equation.
r + -0.9r = 30 + 0.9r + -0.9r

Combine like terms: r + -0.9r = 0.1r
0.1r = 30 + 0.9r + -0.9r

Combine like terms: 0.9r + -0.9r = 0.0
0.1r = 30 + 0.0
0.1r = 30

Divide each side by '0.1'.
r = 300

Simplifying
r = 300

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