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Simplifying -9 + -3r = 3(3r + 5) Reorder the terms: -9 + -3r = 3(5 + 3r) -9 + -3r = (5 * 3 + 3r * 3) -9 + -3r = (15 + 9r) Solving -9 + -3r = 15 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -9 + -3r + -9r = 15 + 9r + -9r Combine like terms: -3r + -9r = -12r -9 + -12r = 15 + 9r + -9r Combine like terms: 9r + -9r = 0 -9 + -12r = 15 + 0 -9 + -12r = 15 Add '9' to each side of the equation. -9 + 9 + -12r = 15 + 9 Combine like terms: -9 + 9 = 0 0 + -12r = 15 + 9 -12r = 15 + 9 Combine like terms: 15 + 9 = 24 -12r = 24 Divide each side by '-12'. r = -2 Simplifying r = -2
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