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Simplifying 3x2 + -9x = 3x2 + -6x + -9 Reorder the terms: -9x + 3x2 = 3x2 + -6x + -9 Reorder the terms: -9x + 3x2 = -9 + -6x + 3x2 Add '-3x2' to each side of the equation. -9x + 3x2 + -3x2 = -9 + -6x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -9x + 0 = -9 + -6x + 3x2 + -3x2 -9x = -9 + -6x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -9x = -9 + -6x + 0 -9x = -9 + -6x Solving -9x = -9 + -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. -9x + 6x = -9 + -6x + 6x Combine like terms: -9x + 6x = -3x -3x = -9 + -6x + 6x Combine like terms: -6x + 6x = 0 -3x = -9 + 0 -3x = -9 Divide each side by '-3'. x = 3 Simplifying x = 3
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