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Simplifying r + 1 + -8 = -2 Reorder the terms: 1 + -8 + r = -2 Combine like terms: 1 + -8 = -7 -7 + r = -2 Solving -7 + r = -2 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 + r = -2 + 7 Combine like terms: -7 + 7 = 0 0 + r = -2 + 7 r = -2 + 7 Combine like terms: -2 + 7 = 5 r = 5 Simplifying r = 5
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