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Simplifying -8 = r + r Combine like terms: r + r = 2r -8 = 2r Solving -8 = 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -8 + -2r = 2r + -2r Combine like terms: 2r + -2r = 0 -8 + -2r = 0 Add '8' to each side of the equation. -8 + 8 + -2r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -2r = 0 + 8 -2r = 0 + 8 Combine like terms: 0 + 8 = 8 -2r = 8 Divide each side by '-2'. r = -4 Simplifying r = -4
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