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Simplifying -9 + -3(2r + -1) = -18 Reorder the terms: -9 + -3(-1 + 2r) = -18 -9 + (-1 * -3 + 2r * -3) = -18 -9 + (3 + -6r) = -18 Combine like terms: -9 + 3 = -6 -6 + -6r = -18 Solving -6 + -6r = -18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -6r = -18 + 6 Combine like terms: -6 + 6 = 0 0 + -6r = -18 + 6 -6r = -18 + 6 Combine like terms: -18 + 6 = -12 -6r = -12 Divide each side by '-6'. r = 2 Simplifying r = 2
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