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Simplifying 4(7x + -7) = 28x + -28 Reorder the terms: 4(-7 + 7x) = 28x + -28 (-7 * 4 + 7x * 4) = 28x + -28 (-28 + 28x) = 28x + -28 Reorder the terms: -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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