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Simplifying 25r = 100r + -420 Reorder the terms: 25r = -420 + 100r Solving 25r = -420 + 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. 25r + -100r = -420 + 100r + -100r Combine like terms: 25r + -100r = -75r -75r = -420 + 100r + -100r Combine like terms: 100r + -100r = 0 -75r = -420 + 0 -75r = -420 Divide each side by '-75'. r = 5.6 Simplifying r = 5.6
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