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Simplifying 28 + 2r = -1r + 5(r + 4) Reorder the terms: 28 + 2r = -1r + 5(4 + r) 28 + 2r = -1r + (4 * 5 + r * 5) 28 + 2r = -1r + (20 + 5r) Reorder the terms: 28 + 2r = 20 + -1r + 5r Combine like terms: -1r + 5r = 4r 28 + 2r = 20 + 4r Solving 28 + 2r = 20 + 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. 28 + 2r + -4r = 20 + 4r + -4r Combine like terms: 2r + -4r = -2r 28 + -2r = 20 + 4r + -4r Combine like terms: 4r + -4r = 0 28 + -2r = 20 + 0 28 + -2r = 20 Add '-28' to each side of the equation. 28 + -28 + -2r = 20 + -28 Combine like terms: 28 + -28 = 0 0 + -2r = 20 + -28 -2r = 20 + -28 Combine like terms: 20 + -28 = -8 -2r = -8 Divide each side by '-2'. r = 4 Simplifying r = 4
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