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Simplifying 26 = r + -1(-13) Multiply -1 * -13 26 = r + 13 Reorder the terms: 26 = 13 + r Solving 26 = 13 + 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. 26 + -1r = 13 + r + -1r Combine like terms: r + -1r = 0 26 + -1r = 13 + 0 26 + -1r = 13 Add '-26' to each side of the equation. 26 + -26 + -1r = 13 + -26 Combine like terms: 26 + -26 = 0 0 + -1r = 13 + -26 -1r = 13 + -26 Combine like terms: 13 + -26 = -13 -1r = -13 Divide each side by '-1'. r = 13 Simplifying r = 13
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