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Simplifying 8r + -21 = -36 + 3r Reorder the terms: -21 + 8r = -36 + 3r Solving -21 + 8r = -36 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -21 + 8r + -3r = -36 + 3r + -3r Combine like terms: 8r + -3r = 5r -21 + 5r = -36 + 3r + -3r Combine like terms: 3r + -3r = 0 -21 + 5r = -36 + 0 -21 + 5r = -36 Add '21' to each side of the equation. -21 + 21 + 5r = -36 + 21 Combine like terms: -21 + 21 = 0 0 + 5r = -36 + 21 5r = -36 + 21 Combine like terms: -36 + 21 = -15 5r = -15 Divide each side by '5'. r = -3 Simplifying r = -3
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