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