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Simplifying 12x + -3x + 7 = -9 + 2x + 16 + 7x Reorder the terms: 7 + 12x + -3x = -9 + 2x + 16 + 7x Combine like terms: 12x + -3x = 9x 7 + 9x = -9 + 2x + 16 + 7x Reorder the terms: 7 + 9x = -9 + 16 + 2x + 7x Combine like terms: -9 + 16 = 7 7 + 9x = 7 + 2x + 7x Combine like terms: 2x + 7x = 9x 7 + 9x = 7 + 9x Add '-7' to each side of the equation. 7 + -7 + 9x = 7 + -7 + 9x Combine like terms: 7 + -7 = 0 0 + 9x = 7 + -7 + 9x 9x = 7 + -7 + 9x Combine like terms: 7 + -7 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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