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Simplifying r + 7 = -7 + -1r Reorder the terms: 7 + r = -7 + -1r Solving 7 + r = -7 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 7 + r + r = -7 + -1r + r Combine like terms: r + r = 2r 7 + 2r = -7 + -1r + r Combine like terms: -1r + r = 0 7 + 2r = -7 + 0 7 + 2r = -7 Add '-7' to each side of the equation. 7 + -7 + 2r = -7 + -7 Combine like terms: 7 + -7 = 0 0 + 2r = -7 + -7 2r = -7 + -7 Combine like terms: -7 + -7 = -14 2r = -14 Divide each side by '2'. r = -7 Simplifying r = -7
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