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Simplifying 13 = r + -5 Reorder the terms: 13 = -5 + r Solving 13 = -5 + 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 + -1r = -5 + r + -1r Combine like terms: r + -1r = 0 13 + -1r = -5 + 0 13 + -1r = -5 Add '-13' to each side of the equation. 13 + -13 + -1r = -5 + -13 Combine like terms: 13 + -13 = 0 0 + -1r = -5 + -13 -1r = -5 + -13 Combine like terms: -5 + -13 = -18 -1r = -18 Divide each side by '-1'. r = 18 Simplifying r = 18
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