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Simplifying (r + 1) + (r + -8) = 45 Reorder the terms: (1 + r) + (r + -8) = 45 Remove parenthesis around (1 + r) 1 + r + (r + -8) = 45 Reorder the terms: 1 + r + (-8 + r) = 45 Remove parenthesis around (-8 + r) 1 + r + -8 + r = 45 Reorder the terms: 1 + -8 + r + r = 45 Combine like terms: 1 + -8 = -7 -7 + r + r = 45 Combine like terms: r + r = 2r -7 + 2r = 45 Solving -7 + 2r = 45 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 2r = 45 + 7 Combine like terms: -7 + 7 = 0 0 + 2r = 45 + 7 2r = 45 + 7 Combine like terms: 45 + 7 = 52 2r = 52 Divide each side by '2'. r = 26 Simplifying r = 26
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