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Simplifying 4x + -21 = 4x + -21 Reorder the terms: -21 + 4x = 4x + -21 Reorder the terms: -21 + 4x = -21 + 4x Add '21' to each side of the equation. -21 + 21 + 4x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 0 + 4x = -21 + 21 + 4x 4x = -21 + 21 + 4x Combine like terms: -21 + 21 = 0 4x = 0 + 4x 4x = 4x Add '-4x' to each side of the equation. 4x + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 0 = 4x + -4x Combine like terms: 4x + -4x = 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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