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Simplifying -28 = -7(3x + 4) + 21x Reorder the terms: -28 = -7(4 + 3x) + 21x -28 = (4 * -7 + 3x * -7) + 21x -28 = (-28 + -21x) + 21x Combine like terms: -21x + 21x = 0 -28 = -28 + 0 -28 = -28 Add '28' to each side of the equation. -28 + 28 = -28 + 28 Combine like terms: -28 + 28 = 0 0 = -28 + 28 Combine like terms: -28 + 28 = 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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