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Simplifying 7r + -20 = -20 + r Reorder the terms: -20 + 7r = -20 + r Add '20' to each side of the equation. -20 + 20 + 7r = -20 + 20 + r Combine like terms: -20 + 20 = 0 0 + 7r = -20 + 20 + r 7r = -20 + 20 + r Combine like terms: -20 + 20 = 0 7r = 0 + r 7r = r Solving 7r = 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. 7r + -1r = r + -1r Combine like terms: 7r + -1r = 6r 6r = r + -1r Combine like terms: r + -1r = 0 6r = 0 Divide each side by '6'. r = 0 Simplifying r = 0
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