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Simplifying -25 = 3r + -1(-5) Multiply -1 * -5 -25 = 3r + 5 Reorder the terms: -25 = 5 + 3r Solving -25 = 5 + 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. -25 + -3r = 5 + 3r + -3r Combine like terms: 3r + -3r = 0 -25 + -3r = 5 + 0 -25 + -3r = 5 Add '25' to each side of the equation. -25 + 25 + -3r = 5 + 25 Combine like terms: -25 + 25 = 0 0 + -3r = 5 + 25 -3r = 5 + 25 Combine like terms: 5 + 25 = 30 -3r = 30 Divide each side by '-3'. r = -10 Simplifying r = -10
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