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Simplifying -1 + -3(1 + 3r) = -31 -1 + (1 * -3 + 3r * -3) = -31 -1 + (-3 + -9r) = -31 Combine like terms: -1 + -3 = -4 -4 + -9r = -31 Solving -4 + -9r = -31 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -9r = -31 + 4 Combine like terms: -4 + 4 = 0 0 + -9r = -31 + 4 -9r = -31 + 4 Combine like terms: -31 + 4 = -27 -9r = -27 Divide each side by '-9'. r = 3 Simplifying r = 3
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