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Simplifying 3r + 6(r + -2) = 87 Reorder the terms: 3r + 6(-2 + r) = 87 3r + (-2 * 6 + r * 6) = 87 3r + (-12 + 6r) = 87 Reorder the terms: -12 + 3r + 6r = 87 Combine like terms: 3r + 6r = 9r -12 + 9r = 87 Solving -12 + 9r = 87 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 9r = 87 + 12 Combine like terms: -12 + 12 = 0 0 + 9r = 87 + 12 9r = 87 + 12 Combine like terms: 87 + 12 = 99 9r = 99 Divide each side by '9'. r = 11 Simplifying r = 11
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