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Simplifying -3 + -5(3 + -6r) = -258 -3 + (3 * -5 + -6r * -5) = -258 -3 + (-15 + 30r) = -258 Combine like terms: -3 + -15 = -18 -18 + 30r = -258 Solving -18 + 30r = -258 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 30r = -258 + 18 Combine like terms: -18 + 18 = 0 0 + 30r = -258 + 18 30r = -258 + 18 Combine like terms: -258 + 18 = -240 30r = -240 Divide each side by '30'. r = -8 Simplifying r = -8
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