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Simplifying 2(r + -5) + -7 = 1 Reorder the terms: 2(-5 + r) + -7 = 1 (-5 * 2 + r * 2) + -7 = 1 (-10 + 2r) + -7 = 1 Reorder the terms: -10 + -7 + 2r = 1 Combine like terms: -10 + -7 = -17 -17 + 2r = 1 Solving -17 + 2r = 1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + 2r = 1 + 17 Combine like terms: -17 + 17 = 0 0 + 2r = 1 + 17 2r = 1 + 17 Combine like terms: 1 + 17 = 18 2r = 18 Divide each side by '2'. r = 9 Simplifying r = 9
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