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Simplifying 20x2 + -168r + -320 = 0 Reorder the terms: -320 + -168r + 20x2 = 0 Solving -320 + -168r + 20x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '320' to each side of the equation. -320 + -168r + 320 + 20x2 = 0 + 320 Reorder the terms: -320 + 320 + -168r + 20x2 = 0 + 320 Combine like terms: -320 + 320 = 0 0 + -168r + 20x2 = 0 + 320 -168r + 20x2 = 0 + 320 Combine like terms: 0 + 320 = 320 -168r + 20x2 = 320 Add '-20x2' to each side of the equation. -168r + 20x2 + -20x2 = 320 + -20x2 Combine like terms: 20x2 + -20x2 = 0 -168r + 0 = 320 + -20x2 -168r = 320 + -20x2 Divide each side by '-168'. r = -1.904761905 + 0.119047619x2 Simplifying r = -1.904761905 + 0.119047619x2
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