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Simplifying 20 + 4a = 4(a + 5) Reorder the terms: 20 + 4a = 4(5 + a) 20 + 4a = (5 * 4 + a * 4) 20 + 4a = (20 + 4a) Add '-20' to each side of the equation. 20 + -20 + 4a = 20 + -20 + 4a Combine like terms: 20 + -20 = 0 0 + 4a = 20 + -20 + 4a 4a = 20 + -20 + 4a Combine like terms: 20 + -20 = 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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