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Simplifying 39x + 21 = 6(6x + 5) + 3x + -9 Reorder the terms: 21 + 39x = 6(6x + 5) + 3x + -9 Reorder the terms: 21 + 39x = 6(5 + 6x) + 3x + -9 21 + 39x = (5 * 6 + 6x * 6) + 3x + -9 21 + 39x = (30 + 36x) + 3x + -9 Reorder the terms: 21 + 39x = 30 + -9 + 36x + 3x Combine like terms: 30 + -9 = 21 21 + 39x = 21 + 36x + 3x Combine like terms: 36x + 3x = 39x 21 + 39x = 21 + 39x Add '-21' to each side of the equation. 21 + -21 + 39x = 21 + -21 + 39x Combine like terms: 21 + -21 = 0 0 + 39x = 21 + -21 + 39x 39x = 21 + -21 + 39x Combine like terms: 21 + -21 = 0 39x = 0 + 39x 39x = 39x Add '-39x' to each side of the equation. 39x + -39x = 39x + -39x Combine like terms: 39x + -39x = 0 0 = 39x + -39x Combine like terms: 39x + -39x = 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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