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Simplifying 8 + -0.2 = r Combine like terms: 8 + -0.2 = 7.8 7.8 = r Solving 7.8 = 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. 7.8 + -1r = r + -1r Combine like terms: r + -1r = 0 7.8 + -1r = 0 Add '-7.8' to each side of the equation. 7.8 + -7.8 + -1r = 0 + -7.8 Combine like terms: 7.8 + -7.8 = 0.0 0.0 + -1r = 0 + -7.8 -1r = 0 + -7.8 Combine like terms: 0 + -7.8 = -7.8 -1r = -7.8 Divide each side by '-1'. r = 7.8 Simplifying r = 7.8
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