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Simplifying -1r + 3(8 + 3r) = 7 -1r + (8 * 3 + 3r * 3) = 7 -1r + (24 + 9r) = 7 Reorder the terms: 24 + -1r + 9r = 7 Combine like terms: -1r + 9r = 8r 24 + 8r = 7 Solving 24 + 8r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 8r = 7 + -24 Combine like terms: 24 + -24 = 0 0 + 8r = 7 + -24 8r = 7 + -24 Combine like terms: 7 + -24 = -17 8r = -17 Divide each side by '8'. r = -2.125 Simplifying r = -2.125
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