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Simplifying 7(x + 3) = 9x + 8 + -2x + 13 Reorder the terms: 7(3 + x) = 9x + 8 + -2x + 13 (3 * 7 + x * 7) = 9x + 8 + -2x + 13 (21 + 7x) = 9x + 8 + -2x + 13 Reorder the terms: 21 + 7x = 8 + 13 + 9x + -2x Combine like terms: 8 + 13 = 21 21 + 7x = 21 + 9x + -2x Combine like terms: 9x + -2x = 7x 21 + 7x = 21 + 7x Add '-21' to each side of the equation. 21 + -21 + 7x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 0 + 7x = 21 + -21 + 7x 7x = 21 + -21 + 7x Combine like terms: 21 + -21 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 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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