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Simplifying 21 = 6 + -2.3r + -2.7r Combine like terms: -2.3r + -2.7r = -5r 21 = 6 + -5r Solving 21 = 6 + -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 = 6 + -5r + 5r Combine like terms: -5r + 5r = 0 21 + 5r = 6 + 0 21 + 5r = 6 Add '-21' to each side of the equation. 21 + -21 + 5r = 6 + -21 Combine like terms: 21 + -21 = 0 0 + 5r = 6 + -21 5r = 6 + -21 Combine like terms: 6 + -21 = -15 5r = -15 Divide each side by '5'. r = -3 Simplifying r = -3
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