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Simplifying 5r + 20 + -1(r + -3) = 5 Reorder the terms: 5r + 20 + -1(-3 + r) = 5 5r + 20 + (-3 * -1 + r * -1) = 5 5r + 20 + (3 + -1r) = 5 Reorder the terms: 20 + 3 + 5r + -1r = 5 Combine like terms: 20 + 3 = 23 23 + 5r + -1r = 5 Combine like terms: 5r + -1r = 4r 23 + 4r = 5 Solving 23 + 4r = 5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-23' to each side of the equation. 23 + -23 + 4r = 5 + -23 Combine like terms: 23 + -23 = 0 0 + 4r = 5 + -23 4r = 5 + -23 Combine like terms: 5 + -23 = -18 4r = -18 Divide each side by '4'. r = -4.5 Simplifying r = -4.5
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