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Simplifying 21y + 17 = 21y + 17 Reorder the terms: 17 + 21y = 21y + 17 Reorder the terms: 17 + 21y = 17 + 21y Add '-17' to each side of the equation. 17 + -17 + 21y = 17 + -17 + 21y Combine like terms: 17 + -17 = 0 0 + 21y = 17 + -17 + 21y 21y = 17 + -17 + 21y Combine like terms: 17 + -17 = 0 21y = 0 + 21y 21y = 21y Add '-21y' to each side of the equation. 21y + -21y = 21y + -21y Combine like terms: 21y + -21y = 0 0 = 21y + -21y Combine like terms: 21y + -21y = 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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