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