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Simplifying 2r + -13 = -18 + r Reorder the terms: -13 + 2r = -18 + r Solving -13 + 2r = -18 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -13 + 2r + -1r = -18 + r + -1r Combine like terms: 2r + -1r = 1r -13 + 1r = -18 + r + -1r Combine like terms: r + -1r = 0 -13 + 1r = -18 + 0 -13 + 1r = -18 Add '13' to each side of the equation. -13 + 13 + 1r = -18 + 13 Combine like terms: -13 + 13 = 0 0 + 1r = -18 + 13 1r = -18 + 13 Combine like terms: -18 + 13 = -5 1r = -5 Divide each side by '1'. r = -5 Simplifying r = -5
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