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Simplifying 8r + -1 = -1r + -10 Reorder the terms: -1 + 8r = -1r + -10 Reorder the terms: -1 + 8r = -10 + -1r Solving -1 + 8r = -10 + -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. -1 + 8r + r = -10 + -1r + r Combine like terms: 8r + r = 9r -1 + 9r = -10 + -1r + r Combine like terms: -1r + r = 0 -1 + 9r = -10 + 0 -1 + 9r = -10 Add '1' to each side of the equation. -1 + 1 + 9r = -10 + 1 Combine like terms: -1 + 1 = 0 0 + 9r = -10 + 1 9r = -10 + 1 Combine like terms: -10 + 1 = -9 9r = -9 Divide each side by '9'. r = -1 Simplifying r = -1
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