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Simplifying -15 = -3 + -3(2r + 2) Reorder the terms: -15 = -3 + -3(2 + 2r) -15 = -3 + (2 * -3 + 2r * -3) -15 = -3 + (-6 + -6r) Combine like terms: -3 + -6 = -9 -15 = -9 + -6r Solving -15 = -9 + -6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6r' to each side of the equation. -15 + 6r = -9 + -6r + 6r Combine like terms: -6r + 6r = 0 -15 + 6r = -9 + 0 -15 + 6r = -9 Add '15' to each side of the equation. -15 + 15 + 6r = -9 + 15 Combine like terms: -15 + 15 = 0 0 + 6r = -9 + 15 6r = -9 + 15 Combine like terms: -9 + 15 = 6 6r = 6 Divide each side by '6'. r = 1 Simplifying r = 1
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