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Simplifying 4x2 + -12r + -400 = 0 Reorder the terms: -400 + -12r + 4x2 = 0 Solving -400 + -12r + 4x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '400' to each side of the equation. -400 + -12r + 400 + 4x2 = 0 + 400 Reorder the terms: -400 + 400 + -12r + 4x2 = 0 + 400 Combine like terms: -400 + 400 = 0 0 + -12r + 4x2 = 0 + 400 -12r + 4x2 = 0 + 400 Combine like terms: 0 + 400 = 400 -12r + 4x2 = 400 Add '-4x2' to each side of the equation. -12r + 4x2 + -4x2 = 400 + -4x2 Combine like terms: 4x2 + -4x2 = 0 -12r + 0 = 400 + -4x2 -12r = 400 + -4x2 Divide each side by '-12'. r = -33.33333333 + 0.3333333333x2 Simplifying r = -33.33333333 + 0.3333333333x2
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