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Simplifying 8r + -24 = -21 + 7r Reorder the terms: -24 + 8r = -21 + 7r Solving -24 + 8r = -21 + 7r 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. -24 + 8r + -7r = -21 + 7r + -7r Combine like terms: 8r + -7r = 1r -24 + 1r = -21 + 7r + -7r Combine like terms: 7r + -7r = 0 -24 + 1r = -21 + 0 -24 + 1r = -21 Add '24' to each side of the equation. -24 + 24 + 1r = -21 + 24 Combine like terms: -24 + 24 = 0 0 + 1r = -21 + 24 1r = -21 + 24 Combine like terms: -21 + 24 = 3 1r = 3 Divide each side by '1'. r = 3 Simplifying r = 3
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