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Simplifying 2r + -18 = -1(2 + -4r) Reorder the terms: -18 + 2r = -1(2 + -4r) -18 + 2r = (2 * -1 + -4r * -1) -18 + 2r = (-2 + 4r) Solving -18 + 2r = -2 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -18 + 2r + -4r = -2 + 4r + -4r Combine like terms: 2r + -4r = -2r -18 + -2r = -2 + 4r + -4r Combine like terms: 4r + -4r = 0 -18 + -2r = -2 + 0 -18 + -2r = -2 Add '18' to each side of the equation. -18 + 18 + -2r = -2 + 18 Combine like terms: -18 + 18 = 0 0 + -2r = -2 + 18 -2r = -2 + 18 Combine like terms: -2 + 18 = 16 -2r = 16 Divide each side by '-2'. r = -8 Simplifying r = -8
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