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Simplifying 1 + -9r + r + -8 = 0 Reorder the terms: 1 + -8 + -9r + r = 0 Combine like terms: 1 + -8 = -7 -7 + -9r + r = 0 Combine like terms: -9r + r = -8r -7 + -8r = 0 Solving -7 + -8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -8r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -8r = 0 + 7 -8r = 0 + 7 Combine like terms: 0 + 7 = 7 -8r = 7 Divide each side by '-8'. r = -0.875 Simplifying r = -0.875
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