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Simplifying -4 + 3 = 8r + -9 Combine like terms: -4 + 3 = -1 -1 = 8r + -9 Reorder the terms: -1 = -9 + 8r Solving -1 = -9 + 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. -1 + -8r = -9 + 8r + -8r Combine like terms: 8r + -8r = 0 -1 + -8r = -9 + 0 -1 + -8r = -9 Add '1' to each side of the equation. -1 + 1 + -8r = -9 + 1 Combine like terms: -1 + 1 = 0 0 + -8r = -9 + 1 -8r = -9 + 1 Combine like terms: -9 + 1 = -8 -8r = -8 Divide each side by '-8'. r = 1 Simplifying r = 1
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