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Simplifying -2(2 + -1r) + 4(-9r + -4) = 0 (2 * -2 + -1r * -2) + 4(-9r + -4) = 0 (-4 + 2r) + 4(-9r + -4) = 0 Reorder the terms: -4 + 2r + 4(-4 + -9r) = 0 -4 + 2r + (-4 * 4 + -9r * 4) = 0 -4 + 2r + (-16 + -36r) = 0 Reorder the terms: -4 + -16 + 2r + -36r = 0 Combine like terms: -4 + -16 = -20 -20 + 2r + -36r = 0 Combine like terms: 2r + -36r = -34r -20 + -34r = 0 Solving -20 + -34r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -34r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -34r = 0 + 20 -34r = 0 + 20 Combine like terms: 0 + 20 = 20 -34r = 20 Divide each side by '-34'. r = -0.5882352941 Simplifying r = -0.5882352941
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