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Simplifying 6(3r + -6) + -6r = -87 Reorder the terms: 6(-6 + 3r) + -6r = -87 (-6 * 6 + 3r * 6) + -6r = -87 (-36 + 18r) + -6r = -87 Combine like terms: 18r + -6r = 12r -36 + 12r = -87 Solving -36 + 12r = -87 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 12r = -87 + 36 Combine like terms: -36 + 36 = 0 0 + 12r = -87 + 36 12r = -87 + 36 Combine like terms: -87 + 36 = -51 12r = -51 Divide each side by '12'. r = -4.25 Simplifying r = -4.25
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