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Simplifying 9y + -7 = 9y + 4 Reorder the terms: -7 + 9y = 9y + 4 Reorder the terms: -7 + 9y = 4 + 9y Add '-9y' to each side of the equation. -7 + 9y + -9y = 4 + 9y + -9y Combine like terms: 9y + -9y = 0 -7 + 0 = 4 + 9y + -9y -7 = 4 + 9y + -9y Combine like terms: 9y + -9y = 0 -7 = 4 + 0 -7 = 4 Solving -7 = 4 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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