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Simplifying 2r + 8 + -1r = -7 Reorder the terms: 8 + 2r + -1r = -7 Combine like terms: 2r + -1r = 1r 8 + 1r = -7 Solving 8 + 1r = -7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 1r = -7 + -8 Combine like terms: 8 + -8 = 0 0 + 1r = -7 + -8 1r = -7 + -8 Combine like terms: -7 + -8 = -15 1r = -15 Divide each side by '1'. r = -15 Simplifying r = -15
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