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Simplifying 5x + 21 + -1x = 7(3 + x) + -3x Reorder the terms: 21 + 5x + -1x = 7(3 + x) + -3x Combine like terms: 5x + -1x = 4x 21 + 4x = 7(3 + x) + -3x 21 + 4x = (3 * 7 + x * 7) + -3x 21 + 4x = (21 + 7x) + -3x Combine like terms: 7x + -3x = 4x 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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