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Simplifying x2 + 3x = x(x + -12) Reorder the terms: 3x + x2 = x(x + -12) Reorder the terms: 3x + x2 = x(-12 + x) 3x + x2 = (-12 * x + x * x) 3x + x2 = (-12x + x2) Add '-1x2' to each side of the equation. 3x + x2 + -1x2 = -12x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x + 0 = -12x + x2 + -1x2 3x = -12x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x = -12x + 0 3x = -12x Solving 3x = -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 3x + 12x = -12x + 12x Combine like terms: 3x + 12x = 15x 15x = -12x + 12x Combine like terms: -12x + 12x = 0 15x = 0 Divide each side by '15'. x = 0 Simplifying x = 0
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