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Simplifying 3x2 + -21x + -18 = 3x2 + -6x + -24 Reorder the terms: -18 + -21x + 3x2 = 3x2 + -6x + -24 Reorder the terms: -18 + -21x + 3x2 = -24 + -6x + 3x2 Add '-3x2' to each side of the equation. -18 + -21x + 3x2 + -3x2 = -24 + -6x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -18 + -21x + 0 = -24 + -6x + 3x2 + -3x2 -18 + -21x = -24 + -6x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -18 + -21x = -24 + -6x + 0 -18 + -21x = -24 + -6x Solving -18 + -21x = -24 + -6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6x' to each side of the equation. -18 + -21x + 6x = -24 + -6x + 6x Combine like terms: -21x + 6x = -15x -18 + -15x = -24 + -6x + 6x Combine like terms: -6x + 6x = 0 -18 + -15x = -24 + 0 -18 + -15x = -24 Add '18' to each side of the equation. -18 + 18 + -15x = -24 + 18 Combine like terms: -18 + 18 = 0 0 + -15x = -24 + 18 -15x = -24 + 18 Combine like terms: -24 + 18 = -6 -15x = -6 Divide each side by '-15'. x = 0.4 Simplifying x = 0.4
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