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Simplifying -7a + -21 = -7(a + 3) Reorder the terms: -21 + -7a = -7(a + 3) Reorder the terms: -21 + -7a = -7(3 + a) -21 + -7a = (3 * -7 + a * -7) -21 + -7a = (-21 + -7a) Add '21' to each side of the equation. -21 + 21 + -7a = -21 + 21 + -7a Combine like terms: -21 + 21 = 0 0 + -7a = -21 + 21 + -7a -7a = -21 + 21 + -7a Combine like terms: -21 + 21 = 0 -7a = 0 + -7a -7a = -7a Add '7a' to each side of the equation. -7a + 7a = -7a + 7a Combine like terms: -7a + 7a = 0 0 = -7a + 7a Combine like terms: -7a + 7a = 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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