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Simplifying -0.4(-4.9 + -2r) = 0 (-4.9 * -0.4 + -2r * -0.4) = 0 (1.96 + 0.8r) = 0 Solving 1.96 + 0.8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1.96' to each side of the equation. 1.96 + -1.96 + 0.8r = 0 + -1.96 Combine like terms: 1.96 + -1.96 = 0.00 0.00 + 0.8r = 0 + -1.96 0.8r = 0 + -1.96 Combine like terms: 0 + -1.96 = -1.96 0.8r = -1.96 Divide each side by '0.8'. r = -2.45 Simplifying r = -2.45
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