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Simplifying 25r + 420 = 100r Reorder the terms: 420 + 25r = 100r Solving 420 + 25r = 100r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-100r' to each side of the equation. 420 + 25r + -100r = 100r + -100r Combine like terms: 25r + -100r = -75r 420 + -75r = 100r + -100r Combine like terms: 100r + -100r = 0 420 + -75r = 0 Add '-420' to each side of the equation. 420 + -420 + -75r = 0 + -420 Combine like terms: 420 + -420 = 0 0 + -75r = 0 + -420 -75r = 0 + -420 Combine like terms: 0 + -420 = -420 -75r = -420 Divide each side by '-75'. r = 5.6 Simplifying r = 5.6
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