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Simplifying 21r + -7 = 6 + 6r Reorder the terms: -7 + 21r = 6 + 6r Solving -7 + 21r = 6 + 6r 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. -7 + 21r + -6r = 6 + 6r + -6r Combine like terms: 21r + -6r = 15r -7 + 15r = 6 + 6r + -6r Combine like terms: 6r + -6r = 0 -7 + 15r = 6 + 0 -7 + 15r = 6 Add '7' to each side of the equation. -7 + 7 + 15r = 6 + 7 Combine like terms: -7 + 7 = 0 0 + 15r = 6 + 7 15r = 6 + 7 Combine like terms: 6 + 7 = 13 15r = 13 Divide each side by '15'. r = 0.8666666667 Simplifying r = 0.8666666667
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