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