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Simplifying -1 = -7 + -8r + 6 Reorder the terms: -1 = -7 + 6 + -8r Combine like terms: -7 + 6 = -1 -1 = -1 + -8r Add '1' to each side of the equation. -1 + 1 = -1 + 1 + -8r Combine like terms: -1 + 1 = 0 0 = -1 + 1 + -8r Combine like terms: -1 + 1 = 0 0 = 0 + -8r 0 = -8r Solving 0 = -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. 0 + 8r = -8r + 8r Remove the zero: 8r = -8r + 8r Combine like terms: -8r + 8r = 0 8r = 0 Divide each side by '8'. r = 0 Simplifying r = 0
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