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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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