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Simplifying 3x2 + 3x + -15 = 3x2 + -9x + -30 Reorder the terms: -15 + 3x + 3x2 = 3x2 + -9x + -30 Reorder the terms: -15 + 3x + 3x2 = -30 + -9x + 3x2 Add '-3x2' to each side of the equation. -15 + 3x + 3x2 + -3x2 = -30 + -9x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -15 + 3x + 0 = -30 + -9x + 3x2 + -3x2 -15 + 3x = -30 + -9x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -15 + 3x = -30 + -9x + 0 -15 + 3x = -30 + -9x Solving -15 + 3x = -30 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -15 + 3x + 9x = -30 + -9x + 9x Combine like terms: 3x + 9x = 12x -15 + 12x = -30 + -9x + 9x Combine like terms: -9x + 9x = 0 -15 + 12x = -30 + 0 -15 + 12x = -30 Add '15' to each side of the equation. -15 + 15 + 12x = -30 + 15 Combine like terms: -15 + 15 = 0 0 + 12x = -30 + 15 12x = -30 + 15 Combine like terms: -30 + 15 = -15 12x = -15 Divide each side by '12'. x = -1.25 Simplifying x = -1.25
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