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Simplifying 21 = 6r + 5 + -7t Reorder the terms: 21 = 5 + 6r + -7t Solving 21 = 5 + 6r + -7t Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. 21 + -6r = 5 + 6r + -6r + -7t Combine like terms: 6r + -6r = 0 21 + -6r = 5 + 0 + -7t 21 + -6r = 5 + -7t Add '-21' to each side of the equation. 21 + -21 + -6r = 5 + -21 + -7t Combine like terms: 21 + -21 = 0 0 + -6r = 5 + -21 + -7t -6r = 5 + -21 + -7t Combine like terms: 5 + -21 = -16 -6r = -16 + -7t Divide each side by '-6'. r = 2.666666667 + 1.166666667t Simplifying r = 2.666666667 + 1.166666667t
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