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Simplifying 20r + -200 = 10r + 200 Reorder the terms: -200 + 20r = 10r + 200 Reorder the terms: -200 + 20r = 200 + 10r Solving -200 + 20r = 200 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -200 + 20r + -10r = 200 + 10r + -10r Combine like terms: 20r + -10r = 10r -200 + 10r = 200 + 10r + -10r Combine like terms: 10r + -10r = 0 -200 + 10r = 200 + 0 -200 + 10r = 200 Add '200' to each side of the equation. -200 + 200 + 10r = 200 + 200 Combine like terms: -200 + 200 = 0 0 + 10r = 200 + 200 10r = 200 + 200 Combine like terms: 200 + 200 = 400 10r = 400 Divide each side by '10'. r = 40 Simplifying r = 40
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