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Simplifying 6.4 = (-0.4r) Solving 6.4 = (-0.4r) Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '(0.4r)' to each side of the equation. 6.4 + (0.4r) = (-0.4r) + (0.4r) Combine like terms: (-0.4r) + (0.4r) = 0.0 6.4 + (0.4r) = 0.0 Add '-6.4' to each side of the equation. 6.4 + -6.4 + (0.4r) = 0.0 + -6.4 Combine like terms: 6.4 + -6.4 = 0.0 0.0 + (0.4r) = 0.0 + -6.4 (0.4r) = 0.0 + -6.4 Combine like terms: 0.0 + -6.4 = -6.4 (0.4r) = -6.4 Divide each side by '0.4'. r = -16 Simplifying r = -16
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