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Simplifying 4z + -9 = 4z + 12 Reorder the terms: -9 + 4z = 4z + 12 Reorder the terms: -9 + 4z = 12 + 4z Add '-4z' to each side of the equation. -9 + 4z + -4z = 12 + 4z + -4z Combine like terms: 4z + -4z = 0 -9 + 0 = 12 + 4z + -4z -9 = 12 + 4z + -4z Combine like terms: 4z + -4z = 0 -9 = 12 + 0 -9 = 12 Solving -9 = 12 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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