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Simplifying 7x + 12 + -9x = 17 + -15x + 13x + -5 Reorder the terms: 12 + 7x + -9x = 17 + -15x + 13x + -5 Combine like terms: 7x + -9x = -2x 12 + -2x = 17 + -15x + 13x + -5 Reorder the terms: 12 + -2x = 17 + -5 + -15x + 13x Combine like terms: 17 + -5 = 12 12 + -2x = 12 + -15x + 13x Combine like terms: -15x + 13x = -2x 12 + -2x = 12 + -2x Add '-12' to each side of the equation. 12 + -12 + -2x = 12 + -12 + -2x Combine like terms: 12 + -12 = 0 0 + -2x = 12 + -12 + -2x -2x = 12 + -12 + -2x Combine like terms: 12 + -12 = 0 -2x = 0 + -2x -2x = -2x Add '2x' to each side of the equation. -2x + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 0 = -2x + 2x Combine like terms: -2x + 2x = 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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