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Simplifying 23x + -4(4x + -7) = 28 + 7x Reorder the terms: 23x + -4(-7 + 4x) = 28 + 7x 23x + (-7 * -4 + 4x * -4) = 28 + 7x 23x + (28 + -16x) = 28 + 7x Reorder the terms: 28 + 23x + -16x = 28 + 7x Combine like terms: 23x + -16x = 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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