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Simplifying 28(x + -1) = -7(4 + -1x) + 21x Reorder the terms: 28(-1 + x) = -7(4 + -1x) + 21x (-1 * 28 + x * 28) = -7(4 + -1x) + 21x (-28 + 28x) = -7(4 + -1x) + 21x -28 + 28x = (4 * -7 + -1x * -7) + 21x -28 + 28x = (-28 + 7x) + 21x Combine like terms: 7x + 21x = 28x -28 + 28x = -28 + 28x Add '28' to each side of the equation. -28 + 28 + 28x = -28 + 28 + 28x Combine like terms: -28 + 28 = 0 0 + 28x = -28 + 28 + 28x 28x = -28 + 28 + 28x Combine like terms: -28 + 28 = 0 28x = 0 + 28x 28x = 28x Add '-28x' to each side of the equation. 28x + -28x = 28x + -28x Combine like terms: 28x + -28x = 0 0 = 28x + -28x Combine like terms: 28x + -28x = 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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