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Simplifying -18 = 0.4r + 12 Reorder the terms: -18 = 12 + 0.4r Solving -18 = 12 + 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. -18 + -0.4r = 12 + 0.4r + -0.4r Combine like terms: 0.4r + -0.4r = 0.0 -18 + -0.4r = 12 + 0.0 -18 + -0.4r = 12 Add '18' to each side of the equation. -18 + 18 + -0.4r = 12 + 18 Combine like terms: -18 + 18 = 0 0 + -0.4r = 12 + 18 -0.4r = 12 + 18 Combine like terms: 12 + 18 = 30 -0.4r = 30 Divide each side by '-0.4'. r = -75 Simplifying r = -75
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