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Simplifying 6z + -21 = 6z + 17 Reorder the terms: -21 + 6z = 6z + 17 Reorder the terms: -21 + 6z = 17 + 6z Add '-6z' to each side of the equation. -21 + 6z + -6z = 17 + 6z + -6z Combine like terms: 6z + -6z = 0 -21 + 0 = 17 + 6z + -6z -21 = 17 + 6z + -6z Combine like terms: 6z + -6z = 0 -21 = 17 + 0 -21 = 17 Solving -21 = 17 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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