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