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Simplifying 4(5r + -5) = -20 + -7r Reorder the terms: 4(-5 + 5r) = -20 + -7r (-5 * 4 + 5r * 4) = -20 + -7r (-20 + 20r) = -20 + -7r Add '20' to each side of the equation. -20 + 20 + 20r = -20 + 20 + -7r Combine like terms: -20 + 20 = 0 0 + 20r = -20 + 20 + -7r 20r = -20 + 20 + -7r Combine like terms: -20 + 20 = 0 20r = 0 + -7r 20r = -7r Solving 20r = -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 20r + 7r = -7r + 7r Combine like terms: 20r + 7r = 27r 27r = -7r + 7r Combine like terms: -7r + 7r = 0 27r = 0 Divide each side by '27'. r = 0 Simplifying r = 0
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