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Simplifying 5(6 + -4r) = V + 21 (6 * 5 + -4r * 5) = V + 21 (30 + -20r) = V + 21 Reorder the terms: 30 + -20r = 21 + V Solving 30 + -20r = 21 + V Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -20r = 21 + -30 + V Combine like terms: 30 + -30 = 0 0 + -20r = 21 + -30 + V -20r = 21 + -30 + V Combine like terms: 21 + -30 = -9 -20r = -9 + V Divide each side by '-20'. r = 0.45 + -0.05V Simplifying r = 0.45 + -0.05V
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