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Simplifying -3x + -4x + 9 = 9 + -7x Reorder the terms: 9 + -3x + -4x = 9 + -7x Combine like terms: -3x + -4x = -7x 9 + -7x = 9 + -7x Add '-9' to each side of the equation. 9 + -9 + -7x = 9 + -9 + -7x Combine like terms: 9 + -9 = 0 0 + -7x = 9 + -9 + -7x -7x = 9 + -9 + -7x Combine like terms: 9 + -9 = 0 -7x = 0 + -7x -7x = -7x Add '7x' to each side of the equation. -7x + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 0 = -7x + 7x Combine like terms: -7x + 7x = 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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