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Simplifying -111 = 3(5r + 3) Reorder the terms: -111 = 3(3 + 5r) -111 = (3 * 3 + 5r * 3) -111 = (9 + 15r) Solving -111 = 9 + 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. -111 + -15r = 9 + 15r + -15r Combine like terms: 15r + -15r = 0 -111 + -15r = 9 + 0 -111 + -15r = 9 Add '111' to each side of the equation. -111 + 111 + -15r = 9 + 111 Combine like terms: -111 + 111 = 0 0 + -15r = 9 + 111 -15r = 9 + 111 Combine like terms: 9 + 111 = 120 -15r = 120 Divide each side by '-15'. r = -8 Simplifying r = -8
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