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Simplifying 20 = -1r + 5 Reorder the terms: 20 = 5 + -1r Solving 20 = 5 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 20 + r = 5 + -1r + r Combine like terms: -1r + r = 0 20 + r = 5 + 0 20 + r = 5 Add '-20' to each side of the equation. 20 + -20 + r = 5 + -20 Combine like terms: 20 + -20 = 0 0 + r = 5 + -20 r = 5 + -20 Combine like terms: 5 + -20 = -15 r = -15 Simplifying r = -15
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