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Simplifying 7y + -15 + 2y = 9y + -15 Reorder the terms: -15 + 7y + 2y = 9y + -15 Combine like terms: 7y + 2y = 9y -15 + 9y = 9y + -15 Reorder the terms: -15 + 9y = -15 + 9y Add '15' to each side of the equation. -15 + 15 + 9y = -15 + 15 + 9y Combine like terms: -15 + 15 = 0 0 + 9y = -15 + 15 + 9y 9y = -15 + 15 + 9y Combine like terms: -15 + 15 = 0 9y = 0 + 9y 9y = 9y Add '-9y' to each side of the equation. 9y + -9y = 9y + -9y Combine like terms: 9y + -9y = 0 0 = 9y + -9y Combine like terms: 9y + -9y = 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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