420=r-.30r

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Solution for 420=r-.30r equation:


Simplifying
420 = r + -0.30r

Combine like terms: r + -0.30r = 0.7r
420 = 0.7r

Solving
420 = 0.7r

Solving for variable 'r'.

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

Add '-0.7r' to each side of the equation.
420 + -0.7r = 0.7r + -0.7r

Combine like terms: 0.7r + -0.7r = 0.0
420 + -0.7r = 0.0

Add '-420' to each side of the equation.
420 + -420 + -0.7r = 0.0 + -420

Combine like terms: 420 + -420 = 0
0 + -0.7r = 0.0 + -420
-0.7r = 0.0 + -420

Combine like terms: 0.0 + -420 = -420
-0.7r = -420

Divide each side by '-0.7'.
r = 600

Simplifying
r = 600

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