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