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Simplifying z(z + -1) = (z + 3)(z + -2) Reorder the terms: z(-1 + z) = (z + 3)(z + -2) (-1 * z + z * z) = (z + 3)(z + -2) (-1z + z2) = (z + 3)(z + -2) Reorder the terms: -1z + z2 = (3 + z)(z + -2) Reorder the terms: -1z + z2 = (3 + z)(-2 + z) Multiply (3 + z) * (-2 + z) -1z + z2 = (3(-2 + z) + z(-2 + z)) -1z + z2 = ((-2 * 3 + z * 3) + z(-2 + z)) -1z + z2 = ((-6 + 3z) + z(-2 + z)) -1z + z2 = (-6 + 3z + (-2 * z + z * z)) -1z + z2 = (-6 + 3z + (-2z + z2)) Combine like terms: 3z + -2z = 1z -1z + z2 = (-6 + 1z + z2) Add '-1z2' to each side of the equation. -1z + z2 + -1z2 = -6 + 1z + z2 + -1z2 Combine like terms: z2 + -1z2 = 0 -1z + 0 = -6 + 1z + z2 + -1z2 -1z = -6 + 1z + z2 + -1z2 Combine like terms: z2 + -1z2 = 0 -1z = -6 + 1z + 0 -1z = -6 + 1z Solving -1z = -6 + 1z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. -1z + -1z = -6 + 1z + -1z Combine like terms: -1z + -1z = -2z -2z = -6 + 1z + -1z Combine like terms: 1z + -1z = 0 -2z = -6 + 0 -2z = -6 Divide each side by '-2'. z = 3 Simplifying z = 3
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