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