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Simplifying -0.8r + -3.1 = -8.3 Reorder the terms: -3.1 + -0.8r = -8.3 Solving -3.1 + -0.8r = -8.3 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3.1' to each side of the equation. -3.1 + 3.1 + -0.8r = -8.3 + 3.1 Combine like terms: -3.1 + 3.1 = 0.0 0.0 + -0.8r = -8.3 + 3.1 -0.8r = -8.3 + 3.1 Combine like terms: -8.3 + 3.1 = -5.2 -0.8r = -5.2 Divide each side by '-0.8'. r = 6.5 Simplifying r = 6.5
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