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Simplifying (10r + -20) = (6r) Reorder the terms: (-20 + 10r) = (6r) Remove parenthesis around (-20 + 10r) -20 + 10r = (6r) Solving -20 + 10r = (6r) Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '(-6r)' to each side of the equation. -20 + 10r + (-6r) = (6r) + (-6r) Combine like terms: 10r + (-6r) = 4r -20 + 4r = (6r) + (-6r) Combine like terms: (6r) + (-6r) = 0 -20 + 4r = 0 Add '20' to each side of the equation. -20 + 20 + 4r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 4r = 0 + 20 4r = 0 + 20 Combine like terms: 0 + 20 = 20 4r = 20 Divide each side by '4'. r = 5 Simplifying r = 5
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