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Simplifying -15 = r + -20 Reorder the terms: -15 = -20 + r Solving -15 = -20 + 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. -15 + -1r = -20 + r + -1r Combine like terms: r + -1r = 0 -15 + -1r = -20 + 0 -15 + -1r = -20 Add '15' to each side of the equation. -15 + 15 + -1r = -20 + 15 Combine like terms: -15 + 15 = 0 0 + -1r = -20 + 15 -1r = -20 + 15 Combine like terms: -20 + 15 = -5 -1r = -5 Divide each side by '-1'. r = 5 Simplifying r = 5
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