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Simplifying 4a + -5 = 4(a + -5) + 15 Reorder the terms: -5 + 4a = 4(a + -5) + 15 Reorder the terms: -5 + 4a = 4(-5 + a) + 15 -5 + 4a = (-5 * 4 + a * 4) + 15 -5 + 4a = (-20 + 4a) + 15 Reorder the terms: -5 + 4a = -20 + 15 + 4a Combine like terms: -20 + 15 = -5 -5 + 4a = -5 + 4a Add '5' to each side of the equation. -5 + 5 + 4a = -5 + 5 + 4a Combine like terms: -5 + 5 = 0 0 + 4a = -5 + 5 + 4a 4a = -5 + 5 + 4a Combine like terms: -5 + 5 = 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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