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Simplifying 30 = -3(r + 1) Reorder the terms: 30 = -3(1 + r) 30 = (1 * -3 + r * -3) 30 = (-3 + -3r) Solving 30 = -3 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 30 + 3r = -3 + -3r + 3r Combine like terms: -3r + 3r = 0 30 + 3r = -3 + 0 30 + 3r = -3 Add '-30' to each side of the equation. 30 + -30 + 3r = -3 + -30 Combine like terms: 30 + -30 = 0 0 + 3r = -3 + -30 3r = -3 + -30 Combine like terms: -3 + -30 = -33 3r = -33 Divide each side by '3'. r = -11 Simplifying r = -11
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