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Simplifying -0.4 = -2.8r + -0.63 Reorder the terms: -0.4 = -0.63 + -2.8r Solving -0.4 = -0.63 + -2.8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2.8r' to each side of the equation. -0.4 + 2.8r = -0.63 + -2.8r + 2.8r Combine like terms: -2.8r + 2.8r = 0.0 -0.4 + 2.8r = -0.63 + 0.0 -0.4 + 2.8r = -0.63 Add '0.4' to each side of the equation. -0.4 + 0.4 + 2.8r = -0.63 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + 2.8r = -0.63 + 0.4 2.8r = -0.63 + 0.4 Combine like terms: -0.63 + 0.4 = -0.23 2.8r = -0.23 Divide each side by '2.8'. r = -0.08214285714 Simplifying r = -0.08214285714
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