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Simplifying 8 + -4r + 5r = 0 Combine like terms: -4r + 5r = 1r 8 + 1r = 0 Solving 8 + 1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 1r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 1r = 0 + -8 1r = 0 + -8 Combine like terms: 0 + -8 = -8 1r = -8 Divide each side by '1'. r = -8 Simplifying r = -8
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