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Simplifying 7z + 5 = 7z + 15 Reorder the terms: 5 + 7z = 7z + 15 Reorder the terms: 5 + 7z = 15 + 7z Add '-7z' to each side of the equation. 5 + 7z + -7z = 15 + 7z + -7z Combine like terms: 7z + -7z = 0 5 + 0 = 15 + 7z + -7z 5 = 15 + 7z + -7z Combine like terms: 7z + -7z = 0 5 = 15 + 0 5 = 15 Solving 5 = 15 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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