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Simplifying 1 + -1r + -8 = 9 Reorder the terms: 1 + -8 + -1r = 9 Combine like terms: 1 + -8 = -7 -7 + -1r = 9 Solving -7 + -1r = 9 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 + -1r = 9 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = 9 + 7 -1r = 9 + 7 Combine like terms: 9 + 7 = 16 -1r = 16 Divide each side by '-1'. r = -16 Simplifying r = -16
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