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Simplifying -15 + -5r = 5(1 + 3r) -15 + -5r = (1 * 5 + 3r * 5) -15 + -5r = (5 + 15r) Solving -15 + -5r = 5 + 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 + -5r + -15r = 5 + 15r + -15r Combine like terms: -5r + -15r = -20r -15 + -20r = 5 + 15r + -15r Combine like terms: 15r + -15r = 0 -15 + -20r = 5 + 0 -15 + -20r = 5 Add '15' to each side of the equation. -15 + 15 + -20r = 5 + 15 Combine like terms: -15 + 15 = 0 0 + -20r = 5 + 15 -20r = 5 + 15 Combine like terms: 5 + 15 = 20 -20r = 20 Divide each side by '-20'. r = -1 Simplifying r = -1
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