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Simplifying -8 + -6(1 + -3r) = -140 -8 + (1 * -6 + -3r * -6) = -140 -8 + (-6 + 18r) = -140 Combine like terms: -8 + -6 = -14 -14 + 18r = -140 Solving -14 + 18r = -140 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 18r = -140 + 14 Combine like terms: -14 + 14 = 0 0 + 18r = -140 + 14 18r = -140 + 14 Combine like terms: -140 + 14 = -126 18r = -126 Divide each side by '18'. r = -7 Simplifying r = -7
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