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Simplifying 9x + -7 = -7 + 9x Reorder the terms: -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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