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Simplifying 7t + -2t + 1 = 21 + 3t Reorder the terms: 1 + 7t + -2t = 21 + 3t Combine like terms: 7t + -2t = 5t 1 + 5t = 21 + 3t Solving 1 + 5t = 21 + 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. 1 + 5t + -3t = 21 + 3t + -3t Combine like terms: 5t + -3t = 2t 1 + 2t = 21 + 3t + -3t Combine like terms: 3t + -3t = 0 1 + 2t = 21 + 0 1 + 2t = 21 Add '-1' to each side of the equation. 1 + -1 + 2t = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 2t = 21 + -1 2t = 21 + -1 Combine like terms: 21 + -1 = 20 2t = 20 Divide each side by '2'. t = 10 Simplifying t = 10
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