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Simplifying 3r + 20r + -1(-12) = -11 Multiply -1 * -12 3r + 20r + 12 = -11 Reorder the terms: 12 + 3r + 20r = -11 Combine like terms: 3r + 20r = 23r 12 + 23r = -11 Solving 12 + 23r = -11 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 23r = -11 + -12 Combine like terms: 12 + -12 = 0 0 + 23r = -11 + -12 23r = -11 + -12 Combine like terms: -11 + -12 = -23 23r = -23 Divide each side by '23'. r = -1 Simplifying r = -1
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