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Simplifying -20r + 15 = -10 + -15r Reorder the terms: 15 + -20r = -10 + -15r Solving 15 + -20r = -10 + -15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15r' to each side of the equation. 15 + -20r + 15r = -10 + -15r + 15r Combine like terms: -20r + 15r = -5r 15 + -5r = -10 + -15r + 15r Combine like terms: -15r + 15r = 0 15 + -5r = -10 + 0 15 + -5r = -10 Add '-15' to each side of the equation. 15 + -15 + -5r = -10 + -15 Combine like terms: 15 + -15 = 0 0 + -5r = -10 + -15 -5r = -10 + -15 Combine like terms: -10 + -15 = -25 -5r = -25 Divide each side by '-5'. r = 5 Simplifying r = 5
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