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Simplifying 3(x + 7) + 2x = 21 + 5x Reorder the terms: 3(7 + x) + 2x = 21 + 5x (7 * 3 + x * 3) + 2x = 21 + 5x (21 + 3x) + 2x = 21 + 5x Combine like terms: 3x + 2x = 5x 21 + 5x = 21 + 5x Add '-21' to each side of the equation. 21 + -21 + 5x = 21 + -21 + 5x Combine like terms: 21 + -21 = 0 0 + 5x = 21 + -21 + 5x 5x = 21 + -21 + 5x Combine like terms: 21 + -21 = 0 5x = 0 + 5x 5x = 5x Add '-5x' to each side of the equation. 5x + -5x = 5x + -5x Combine like terms: 5x + -5x = 0 0 = 5x + -5x Combine like terms: 5x + -5x = 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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