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Simplifying 4a2 + -4a = 4a(a + -4) Reorder the terms: -4a + 4a2 = 4a(a + -4) Reorder the terms: -4a + 4a2 = 4a(-4 + a) -4a + 4a2 = (-4 * 4a + a * 4a) -4a + 4a2 = (-16a + 4a2) Add '-4a2' to each side of the equation. -4a + 4a2 + -4a2 = -16a + 4a2 + -4a2 Combine like terms: 4a2 + -4a2 = 0 -4a + 0 = -16a + 4a2 + -4a2 -4a = -16a + 4a2 + -4a2 Combine like terms: 4a2 + -4a2 = 0 -4a = -16a + 0 -4a = -16a Solving -4a = -16a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '16a' to each side of the equation. -4a + 16a = -16a + 16a Combine like terms: -4a + 16a = 12a 12a = -16a + 16a Combine like terms: -16a + 16a = 0 12a = 0 Divide each side by '12'. a = 0 Simplifying a = 0
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