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Simplifying (x + 9)(4x + -5) = 31x + -36 Reorder the terms: (9 + x)(4x + -5) = 31x + -36 Reorder the terms: (9 + x)(-5 + 4x) = 31x + -36 Multiply (9 + x) * (-5 + 4x) (9(-5 + 4x) + x(-5 + 4x)) = 31x + -36 ((-5 * 9 + 4x * 9) + x(-5 + 4x)) = 31x + -36 ((-45 + 36x) + x(-5 + 4x)) = 31x + -36 (-45 + 36x + (-5 * x + 4x * x)) = 31x + -36 (-45 + 36x + (-5x + 4x2)) = 31x + -36 Combine like terms: 36x + -5x = 31x (-45 + 31x + 4x2) = 31x + -36 Reorder the terms: -45 + 31x + 4x2 = -36 + 31x Add '-31x' to each side of the equation. -45 + 31x + -31x + 4x2 = -36 + 31x + -31x Combine like terms: 31x + -31x = 0 -45 + 0 + 4x2 = -36 + 31x + -31x -45 + 4x2 = -36 + 31x + -31x Combine like terms: 31x + -31x = 0 -45 + 4x2 = -36 + 0 -45 + 4x2 = -36 Solving -45 + 4x2 = -36 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + 4x2 = -36 + 45 Combine like terms: -45 + 45 = 0 0 + 4x2 = -36 + 45 4x2 = -36 + 45 Combine like terms: -36 + 45 = 9 4x2 = 9 Divide each side by '4'. x2 = 2.25 Simplifying x2 = 2.25 Take the square root of each side: x = {-1.5, 1.5}
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