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