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Simplifying 3x + -21 + x = 4x + -28 + 7 Reorder the terms: -21 + 3x + x = 4x + -28 + 7 Combine like terms: 3x + x = 4x -21 + 4x = 4x + -28 + 7 Reorder the terms: -21 + 4x = -28 + 7 + 4x Combine like terms: -28 + 7 = -21 -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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