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Simplifying 7 + -9x + 15 = 3x + 22 + -12x Reorder the terms: 7 + 15 + -9x = 3x + 22 + -12x Combine like terms: 7 + 15 = 22 22 + -9x = 3x + 22 + -12x Reorder the terms: 22 + -9x = 22 + 3x + -12x Combine like terms: 3x + -12x = -9x 22 + -9x = 22 + -9x Add '-22' to each side of the equation. 22 + -22 + -9x = 22 + -22 + -9x Combine like terms: 22 + -22 = 0 0 + -9x = 22 + -22 + -9x -9x = 22 + -22 + -9x Combine like terms: 22 + -22 = 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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