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Simplifying -5 = r + -13 Reorder the terms: -5 = -13 + r Solving -5 = -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. -5 + -1r = -13 + r + -1r Combine like terms: r + -1r = 0 -5 + -1r = -13 + 0 -5 + -1r = -13 Add '5' to each side of the equation. -5 + 5 + -1r = -13 + 5 Combine like terms: -5 + 5 = 0 0 + -1r = -13 + 5 -1r = -13 + 5 Combine like terms: -13 + 5 = -8 -1r = -8 Divide each side by '-1'. r = 8 Simplifying r = 8
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