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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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