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Simplifying 3x + 72 = 8(x + 9) + -5x Reorder the terms: 72 + 3x = 8(x + 9) + -5x Reorder the terms: 72 + 3x = 8(9 + x) + -5x 72 + 3x = (9 * 8 + x * 8) + -5x 72 + 3x = (72 + 8x) + -5x Combine like terms: 8x + -5x = 3x 72 + 3x = 72 + 3x Add '-72' to each side of the equation. 72 + -72 + 3x = 72 + -72 + 3x Combine like terms: 72 + -72 = 0 0 + 3x = 72 + -72 + 3x 3x = 72 + -72 + 3x Combine like terms: 72 + -72 = 0 3x = 0 + 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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