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Simplifying 21 = 6t + 5 + -7r Reorder the terms: 21 = 5 + -7r + 6t Solving 21 = 5 + -7r + 6t 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. 21 + 7r = 5 + -7r + 7r + 6t Combine like terms: -7r + 7r = 0 21 + 7r = 5 + 0 + 6t 21 + 7r = 5 + 6t Add '-21' to each side of the equation. 21 + -21 + 7r = 5 + -21 + 6t Combine like terms: 21 + -21 = 0 0 + 7r = 5 + -21 + 6t 7r = 5 + -21 + 6t Combine like terms: 5 + -21 = -16 7r = -16 + 6t Divide each side by '7'. r = -2.285714286 + 0.8571428571t Simplifying r = -2.285714286 + 0.8571428571t
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