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