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Simplifying 5r + -1r + -4 = 20 Reorder the terms: -4 + 5r + -1r = 20 Combine like terms: 5r + -1r = 4r -4 + 4r = 20 Solving -4 + 4r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 4r = 20 + 4 Combine like terms: -4 + 4 = 0 0 + 4r = 20 + 4 4r = 20 + 4 Combine like terms: 20 + 4 = 24 4r = 24 Divide each side by '4'. r = 6 Simplifying r = 6
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