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Simplifying 10r + 21 = -8 Reorder the terms: 21 + 10r = -8 Solving 21 + 10r = -8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 10r = -8 + -21 Combine like terms: 21 + -21 = 0 0 + 10r = -8 + -21 10r = -8 + -21 Combine like terms: -8 + -21 = -29 10r = -29 Divide each side by '10'. r = -2.9 Simplifying r = -2.9
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