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Simplifying 5x + 4 + 7x = 7x + 4 + 5x Reorder the terms: 4 + 5x + 7x = 7x + 4 + 5x Combine like terms: 5x + 7x = 12x 4 + 12x = 7x + 4 + 5x Reorder the terms: 4 + 12x = 4 + 7x + 5x Combine like terms: 7x + 5x = 12x 4 + 12x = 4 + 12x Add '-4' to each side of the equation. 4 + -4 + 12x = 4 + -4 + 12x Combine like terms: 4 + -4 = 0 0 + 12x = 4 + -4 + 12x 12x = 4 + -4 + 12x Combine like terms: 4 + -4 = 0 12x = 0 + 12x 12x = 12x Add '-12x' to each side of the equation. 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 0 = 12x + -12x Combine like terms: 12x + -12x = 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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