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Simplifying 4x2 + -5x + 20 + -1(4x2 + 10x) = 0 Reorder the terms: 4x2 + -5x + 20 + -1(10x + 4x2) = 0 4x2 + -5x + 20 + (10x * -1 + 4x2 * -1) = 0 4x2 + -5x + 20 + (-10x + -4x2) = 0 Reorder the terms: 20 + -5x + -10x + 4x2 + -4x2 = 0 Combine like terms: -5x + -10x = -15x 20 + -15x + 4x2 + -4x2 = 0 Combine like terms: 4x2 + -4x2 = 0 20 + -15x + 0 = 0 20 + -15x = 0 Solving 20 + -15x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -15x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -15x = 0 + -20 -15x = 0 + -20 Combine like terms: 0 + -20 = -20 -15x = -20 Divide each side by '-15'. x = 1.333333333 Simplifying x = 1.333333333
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