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Simplifying -24 = 3r + -1(-15) Multiply -1 * -15 -24 = 3r + 15 Reorder the terms: -24 = 15 + 3r Solving -24 = 15 + 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. -24 + -3r = 15 + 3r + -3r Combine like terms: 3r + -3r = 0 -24 + -3r = 15 + 0 -24 + -3r = 15 Add '24' to each side of the equation. -24 + 24 + -3r = 15 + 24 Combine like terms: -24 + 24 = 0 0 + -3r = 15 + 24 -3r = 15 + 24 Combine like terms: 15 + 24 = 39 -3r = 39 Divide each side by '-3'. r = -13 Simplifying r = -13
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