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Simplifying 3(x * x + -4) = x(3x + -9) Multiply x * x 3(x2 + -4) = x(3x + -9) Reorder the terms: 3(-4 + x2) = x(3x + -9) (-4 * 3 + x2 * 3) = x(3x + -9) (-12 + 3x2) = x(3x + -9) Reorder the terms: -12 + 3x2 = x(-9 + 3x) -12 + 3x2 = (-9 * x + 3x * x) -12 + 3x2 = (-9x + 3x2) Add '-3x2' to each side of the equation. -12 + 3x2 + -3x2 = -9x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -12 + 0 = -9x + 3x2 + -3x2 -12 = -9x + 3x2 + -3x2 Combine like terms: 3x2 + -3x2 = 0 -12 = -9x + 0 -12 = -9x Solving -12 = -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. -12 + 9x = -9x + 9x Combine like terms: -9x + 9x = 0 -12 + 9x = 0 Add '12' to each side of the equation. -12 + 12 + 9x = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 9x = 0 + 12 9x = 0 + 12 Combine like terms: 0 + 12 = 12 9x = 12 Divide each side by '9'. x = 1.333333333 Simplifying x = 1.333333333
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