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Simplifying 3r + -1r + 2(r + 4) = 24 Reorder the terms: 3r + -1r + 2(4 + r) = 24 3r + -1r + (4 * 2 + r * 2) = 24 3r + -1r + (8 + 2r) = 24 Reorder the terms: 8 + 3r + -1r + 2r = 24 Combine like terms: 3r + -1r = 2r 8 + 2r + 2r = 24 Combine like terms: 2r + 2r = 4r 8 + 4r = 24 Solving 8 + 4r = 24 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 4r = 24 + -8 Combine like terms: 8 + -8 = 0 0 + 4r = 24 + -8 4r = 24 + -8 Combine like terms: 24 + -8 = 16 4r = 16 Divide each side by '4'. r = 4 Simplifying r = 4
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