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Simplifying 5(2x + 3) + 6 = 10x + 21 Reorder the terms: 5(3 + 2x) + 6 = 10x + 21 (3 * 5 + 2x * 5) + 6 = 10x + 21 (15 + 10x) + 6 = 10x + 21 Reorder the terms: 15 + 6 + 10x = 10x + 21 Combine like terms: 15 + 6 = 21 21 + 10x = 10x + 21 Reorder the terms: 21 + 10x = 21 + 10x Add '-21' to each side of the equation. 21 + -21 + 10x = 21 + -21 + 10x Combine like terms: 21 + -21 = 0 0 + 10x = 21 + -21 + 10x 10x = 21 + -21 + 10x Combine like terms: 21 + -21 = 0 10x = 0 + 10x 10x = 10x Add '-10x' to each side of the equation. 10x + -10x = 10x + -10x Combine like terms: 10x + -10x = 0 0 = 10x + -10x Combine like terms: 10x + -10x = 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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