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Simplifying 3x + 21 = 7(x + 3) + -4x Reorder the terms: 21 + 3x = 7(x + 3) + -4x Reorder the terms: 21 + 3x = 7(3 + x) + -4x 21 + 3x = (3 * 7 + x * 7) + -4x 21 + 3x = (21 + 7x) + -4x Combine like terms: 7x + -4x = 3x 21 + 3x = 21 + 3x Add '-21' to each side of the equation. 21 + -21 + 3x = 21 + -21 + 3x Combine like terms: 21 + -21 = 0 0 + 3x = 21 + -21 + 3x 3x = 21 + -21 + 3x Combine like terms: 21 + -21 = 0 3x = 0 + 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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