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Simplifying -1x2 + 3x + 18 = -1x2 + -6x Reorder the terms: 18 + 3x + -1x2 = -1x2 + -6x Reorder the terms: 18 + 3x + -1x2 = -6x + -1x2 Add 'x2' to each side of the equation. 18 + 3x + -1x2 + x2 = -6x + -1x2 + x2 Combine like terms: -1x2 + x2 = 0 18 + 3x + 0 = -6x + -1x2 + x2 18 + 3x = -6x + -1x2 + x2 Combine like terms: -1x2 + x2 = 0 18 + 3x = -6x + 0 18 + 3x = -6x Solving 18 + 3x = -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 + 3x + 6x = -6x + 6x Combine like terms: 3x + 6x = 9x 18 + 9x = -6x + 6x Combine like terms: -6x + 6x = 0 18 + 9x = 0 Add '-18' to each side of the equation. 18 + -18 + 9x = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 9x = 0 + -18 9x = 0 + -18 Combine like terms: 0 + -18 = -18 9x = -18 Divide each side by '9'. x = -2 Simplifying x = -2
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