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Simplifying -21 = -5r + 4 Reorder the terms: -21 = 4 + -5r Solving -21 = 4 + -5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5r' to each side of the equation. -21 + 5r = 4 + -5r + 5r Combine like terms: -5r + 5r = 0 -21 + 5r = 4 + 0 -21 + 5r = 4 Add '21' to each side of the equation. -21 + 21 + 5r = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 5r = 4 + 21 5r = 4 + 21 Combine like terms: 4 + 21 = 25 5r = 25 Divide each side by '5'. r = 5 Simplifying r = 5
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