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Simplifying 2r + 18 + -6 = -20 + -2r Reorder the terms: 18 + -6 + 2r = -20 + -2r Combine like terms: 18 + -6 = 12 12 + 2r = -20 + -2r Solving 12 + 2r = -20 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. 12 + 2r + 2r = -20 + -2r + 2r Combine like terms: 2r + 2r = 4r 12 + 4r = -20 + -2r + 2r Combine like terms: -2r + 2r = 0 12 + 4r = -20 + 0 12 + 4r = -20 Add '-12' to each side of the equation. 12 + -12 + 4r = -20 + -12 Combine like terms: 12 + -12 = 0 0 + 4r = -20 + -12 4r = -20 + -12 Combine like terms: -20 + -12 = -32 4r = -32 Divide each side by '4'. r = -8 Simplifying r = -8
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