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Simplifying 28x + -56 = 7(3x + -7) + 7x + -7 Reorder the terms: -56 + 28x = 7(3x + -7) + 7x + -7 Reorder the terms: -56 + 28x = 7(-7 + 3x) + 7x + -7 -56 + 28x = (-7 * 7 + 3x * 7) + 7x + -7 -56 + 28x = (-49 + 21x) + 7x + -7 Reorder the terms: -56 + 28x = -49 + -7 + 21x + 7x Combine like terms: -49 + -7 = -56 -56 + 28x = -56 + 21x + 7x Combine like terms: 21x + 7x = 28x -56 + 28x = -56 + 28x Add '56' to each side of the equation. -56 + 56 + 28x = -56 + 56 + 28x Combine like terms: -56 + 56 = 0 0 + 28x = -56 + 56 + 28x 28x = -56 + 56 + 28x Combine like terms: -56 + 56 = 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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