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Simplifying 15r + -15r + 4r + -3r + r = 20 Combine like terms: 15r + -15r = 0 0 + 4r + -3r + r = 20 4r + -3r + r = 20 Combine like terms: 4r + -3r = 1r 1r + r = 20 Combine like terms: 1r + r = 2r 2r = 20 Solving 2r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '2'. r = 10 Simplifying r = 10
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