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Simplifying 2x(x + 3) = 2x2 + 18 Reorder the terms: 2x(3 + x) = 2x2 + 18 (3 * 2x + x * 2x) = 2x2 + 18 (6x + 2x2) = 2x2 + 18 Reorder the terms: 6x + 2x2 = 18 + 2x2 Add '-2x2' to each side of the equation. 6x + 2x2 + -2x2 = 18 + 2x2 + -2x2 Combine like terms: 2x2 + -2x2 = 0 6x + 0 = 18 + 2x2 + -2x2 6x = 18 + 2x2 + -2x2 Combine like terms: 2x2 + -2x2 = 0 6x = 18 + 0 6x = 18 Solving 6x = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '6'. x = 3 Simplifying x = 3
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