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Simplifying -13 = -15 + r Solving -13 = -15 + 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 = -15 + r + -1r Combine like terms: r + -1r = 0 -13 + -1r = -15 + 0 -13 + -1r = -15 Add '13' to each side of the equation. -13 + 13 + -1r = -15 + 13 Combine like terms: -13 + 13 = 0 0 + -1r = -15 + 13 -1r = -15 + 13 Combine like terms: -15 + 13 = -2 -1r = -2 Divide each side by '-1'. r = 2 Simplifying r = 2
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