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Simplifying 0.9 = r + -9.9 Reorder the terms: 0.9 = -9.9 + r Solving 0.9 = -9.9 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 0.9 + -1r = -9.9 + r + -1r Combine like terms: r + -1r = 0 0.9 + -1r = -9.9 + 0 0.9 + -1r = -9.9 Add '-0.9' to each side of the equation. 0.9 + -0.9 + -1r = -9.9 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + -1r = -9.9 + -0.9 -1r = -9.9 + -0.9 Combine like terms: -9.9 + -0.9 = -10.8 -1r = -10.8 Divide each side by '-1'. r = 10.8 Simplifying r = 10.8
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