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Simplifying -9a + -81 = -9(a + 9) Reorder the terms: -81 + -9a = -9(a + 9) Reorder the terms: -81 + -9a = -9(9 + a) -81 + -9a = (9 * -9 + a * -9) -81 + -9a = (-81 + -9a) Add '81' to each side of the equation. -81 + 81 + -9a = -81 + 81 + -9a Combine like terms: -81 + 81 = 0 0 + -9a = -81 + 81 + -9a -9a = -81 + 81 + -9a Combine like terms: -81 + 81 = 0 -9a = 0 + -9a -9a = -9a Add '9a' to each side of the equation. -9a + 9a = -9a + 9a Combine like terms: -9a + 9a = 0 0 = -9a + 9a Combine like terms: -9a + 9a = 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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