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