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Simplifying 9 + -1(3r + 1) = 12 Reorder the terms: 9 + -1(1 + 3r) = 12 9 + (1 * -1 + 3r * -1) = 12 9 + (-1 + -3r) = 12 Combine like terms: 9 + -1 = 8 8 + -3r = 12 Solving 8 + -3r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3r = 12 + -8 Combine like terms: 8 + -8 = 0 0 + -3r = 12 + -8 -3r = 12 + -8 Combine like terms: 12 + -8 = 4 -3r = 4 Divide each side by '-3'. r = -1.333333333 Simplifying r = -1.333333333
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