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Simplifying 12t + -21 = 3t + 9 Reorder the terms: -21 + 12t = 3t + 9 Reorder the terms: -21 + 12t = 9 + 3t Solving -21 + 12t = 9 + 3t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3t' to each side of the equation. -21 + 12t + -3t = 9 + 3t + -3t Combine like terms: 12t + -3t = 9t -21 + 9t = 9 + 3t + -3t Combine like terms: 3t + -3t = 0 -21 + 9t = 9 + 0 -21 + 9t = 9 Add '21' to each side of the equation. -21 + 21 + 9t = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 9t = 9 + 21 9t = 9 + 21 Combine like terms: 9 + 21 = 30 9t = 30 Divide each side by '9'. t = 3.333333333 Simplifying t = 3.333333333
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