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Simplifying 6r + 5 + -7 = 21 Reorder the terms: 5 + -7 + 6r = 21 Combine like terms: 5 + -7 = -2 -2 + 6r = 21 Solving -2 + 6r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 6r = 21 + 2 Combine like terms: -2 + 2 = 0 0 + 6r = 21 + 2 6r = 21 + 2 Combine like terms: 21 + 2 = 23 6r = 23 Divide each side by '6'. r = 3.833333333 Simplifying r = 3.833333333
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