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Simplifying r + (r + 10) + (r + -13) = 723 Reorder the terms: r + (10 + r) + (r + -13) = 723 Remove parenthesis around (10 + r) r + 10 + r + (r + -13) = 723 Reorder the terms: r + 10 + r + (-13 + r) = 723 Remove parenthesis around (-13 + r) r + 10 + r + -13 + r = 723 Reorder the terms: 10 + -13 + r + r + r = 723 Combine like terms: 10 + -13 = -3 -3 + r + r + r = 723 Combine like terms: r + r = 2r -3 + 2r + r = 723 Combine like terms: 2r + r = 3r -3 + 3r = 723 Solving -3 + 3r = 723 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3r = 723 + 3 Combine like terms: -3 + 3 = 0 0 + 3r = 723 + 3 3r = 723 + 3 Combine like terms: 723 + 3 = 726 3r = 726 Divide each side by '3'. r = 242 Simplifying r = 242
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