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Simplifying 90 = 20r * 10 Reorder the terms for easier multiplication: 90 = 20 * 10r Multiply 20 * 10 90 = 200r Solving 90 = 200r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-200r' to each side of the equation. 90 + -200r = 200r + -200r Combine like terms: 200r + -200r = 0 90 + -200r = 0 Add '-90' to each side of the equation. 90 + -90 + -200r = 0 + -90 Combine like terms: 90 + -90 = 0 0 + -200r = 0 + -90 -200r = 0 + -90 Combine like terms: 0 + -90 = -90 -200r = -90 Divide each side by '-200'. r = 0.45 Simplifying r = 0.45
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