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Simplifying 9t + -21 = 3t + -7 + 6t Reorder the terms: -21 + 9t = 3t + -7 + 6t Reorder the terms: -21 + 9t = -7 + 3t + 6t Combine like terms: 3t + 6t = 9t -21 + 9t = -7 + 9t Add '-9t' to each side of the equation. -21 + 9t + -9t = -7 + 9t + -9t Combine like terms: 9t + -9t = 0 -21 + 0 = -7 + 9t + -9t -21 = -7 + 9t + -9t Combine like terms: 9t + -9t = 0 -21 = -7 + 0 -21 = -7 Solving -21 = -7 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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