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Simplifying 7(r + 4) + -8r = 0 Reorder the terms: 7(4 + r) + -8r = 0 (4 * 7 + r * 7) + -8r = 0 (28 + 7r) + -8r = 0 Combine like terms: 7r + -8r = -1r 28 + -1r = 0 Solving 28 + -1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -1r = 0 + -28 Combine like terms: 28 + -28 = 0 0 + -1r = 0 + -28 -1r = 0 + -28 Combine like terms: 0 + -28 = -28 -1r = -28 Divide each side by '-1'. r = 28 Simplifying r = 28
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