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