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Simplifying 280 = 85r + 55r Combine like terms: 85r + 55r = 140r 280 = 140r Solving 280 = 140r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-140r' to each side of the equation. 280 + -140r = 140r + -140r Combine like terms: 140r + -140r = 0 280 + -140r = 0 Add '-280' to each side of the equation. 280 + -280 + -140r = 0 + -280 Combine like terms: 280 + -280 = 0 0 + -140r = 0 + -280 -140r = 0 + -280 Combine like terms: 0 + -280 = -280 -140r = -280 Divide each side by '-140'. r = 2 Simplifying r = 2
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