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Simplifying -1(r + 2) = -3r + -18 Reorder the terms: -1(2 + r) = -3r + -18 (2 * -1 + r * -1) = -3r + -18 (-2 + -1r) = -3r + -18 Reorder the terms: -2 + -1r = -18 + -3r Solving -2 + -1r = -18 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. -2 + -1r + 3r = -18 + -3r + 3r Combine like terms: -1r + 3r = 2r -2 + 2r = -18 + -3r + 3r Combine like terms: -3r + 3r = 0 -2 + 2r = -18 + 0 -2 + 2r = -18 Add '2' to each side of the equation. -2 + 2 + 2r = -18 + 2 Combine like terms: -2 + 2 = 0 0 + 2r = -18 + 2 2r = -18 + 2 Combine like terms: -18 + 2 = -16 2r = -16 Divide each side by '2'. r = -8 Simplifying r = -8
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