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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 = -4r -2 + -4r = -18 + 3r + -3r Combine like terms: 3r + -3r = 0 -2 + -4r = -18 + 0 -2 + -4r = -18 Add '2' to each side of the equation. -2 + 2 + -4r = -18 + 2 Combine like terms: -2 + 2 = 0 0 + -4r = -18 + 2 -4r = -18 + 2 Combine like terms: -18 + 2 = -16 -4r = -16 Divide each side by '-4'. r = 4 Simplifying r = 4
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