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Simplifying -4(a + 4) = -16 + -4a Reorder the terms: -4(4 + a) = -16 + -4a (4 * -4 + a * -4) = -16 + -4a (-16 + -4a) = -16 + -4a Add '16' to each side of the equation. -16 + 16 + -4a = -16 + 16 + -4a Combine like terms: -16 + 16 = 0 0 + -4a = -16 + 16 + -4a -4a = -16 + 16 + -4a Combine like terms: -16 + 16 = 0 -4a = 0 + -4a -4a = -4a Add '4a' to each side of the equation. -4a + 4a = -4a + 4a Combine like terms: -4a + 4a = 0 0 = -4a + 4a Combine like terms: -4a + 4a = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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