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Simplifying r + -4 = 5 + -9 + -8 Reorder the terms: -4 + r = 5 + -9 + -8 Combine like terms: 5 + -9 = -4 -4 + r = -4 + -8 Combine like terms: -4 + -8 = -12 -4 + r = -12 Solving -4 + r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + r = -12 + 4 Combine like terms: -4 + 4 = 0 0 + r = -12 + 4 r = -12 + 4 Combine like terms: -12 + 4 = -8 r = -8 Simplifying r = -8
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