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Simplifying 4(r + 2) + -7 = 9 Reorder the terms: 4(2 + r) + -7 = 9 (2 * 4 + r * 4) + -7 = 9 (8 + 4r) + -7 = 9 Reorder the terms: 8 + -7 + 4r = 9 Combine like terms: 8 + -7 = 1 1 + 4r = 9 Solving 1 + 4r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4r = 9 + -1 Combine like terms: 1 + -1 = 0 0 + 4r = 9 + -1 4r = 9 + -1 Combine like terms: 9 + -1 = 8 4r = 8 Divide each side by '4'. r = 2 Simplifying r = 2
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