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Simplifying 21 = -2t + 9 Reorder the terms: 21 = 9 + -2t Solving 21 = 9 + -2t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2t' to each side of the equation. 21 + 2t = 9 + -2t + 2t Combine like terms: -2t + 2t = 0 21 + 2t = 9 + 0 21 + 2t = 9 Add '-21' to each side of the equation. 21 + -21 + 2t = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 2t = 9 + -21 2t = 9 + -21 Combine like terms: 9 + -21 = -12 2t = -12 Divide each side by '2'. t = -6 Simplifying t = -6
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