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Simplifying 18 + r = -2r Solving 18 + r = -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. 18 + r + 2r = -2r + 2r Combine like terms: r + 2r = 3r 18 + 3r = -2r + 2r Combine like terms: -2r + 2r = 0 18 + 3r = 0 Add '-18' to each side of the equation. 18 + -18 + 3r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 3r = 0 + -18 3r = 0 + -18 Combine like terms: 0 + -18 = -18 3r = -18 Divide each side by '3'. r = -6 Simplifying r = -6
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