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Simplifying 21r + -20 + 12r = 4r + -28 Reorder the terms: -20 + 21r + 12r = 4r + -28 Combine like terms: 21r + 12r = 33r -20 + 33r = 4r + -28 Reorder the terms: -20 + 33r = -28 + 4r Solving -20 + 33r = -28 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -20 + 33r + -4r = -28 + 4r + -4r Combine like terms: 33r + -4r = 29r -20 + 29r = -28 + 4r + -4r Combine like terms: 4r + -4r = 0 -20 + 29r = -28 + 0 -20 + 29r = -28 Add '20' to each side of the equation. -20 + 20 + 29r = -28 + 20 Combine like terms: -20 + 20 = 0 0 + 29r = -28 + 20 29r = -28 + 20 Combine like terms: -28 + 20 = -8 29r = -8 Divide each side by '29'. r = -0.275862069 Simplifying r = -0.275862069
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