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Simplifying 6a + -21 = 3(2a + -7) Reorder the terms: -21 + 6a = 3(2a + -7) Reorder the terms: -21 + 6a = 3(-7 + 2a) -21 + 6a = (-7 * 3 + 2a * 3) -21 + 6a = (-21 + 6a) Add '21' to each side of the equation. -21 + 21 + 6a = -21 + 21 + 6a Combine like terms: -21 + 21 = 0 0 + 6a = -21 + 21 + 6a 6a = -21 + 21 + 6a Combine like terms: -21 + 21 = 0 6a = 0 + 6a 6a = 6a Add '-6a' to each side of the equation. 6a + -6a = 6a + -6a Combine like terms: 6a + -6a = 0 0 = 6a + -6a Combine like terms: 6a + -6a = 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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