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Simplifying 3t + 2(t + -1) = 21 Reorder the terms: 3t + 2(-1 + t) = 21 3t + (-1 * 2 + t * 2) = 21 3t + (-2 + 2t) = 21 Reorder the terms: -2 + 3t + 2t = 21 Combine like terms: 3t + 2t = 5t -2 + 5t = 21 Solving -2 + 5t = 21 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 5t = 21 + 2 Combine like terms: -2 + 2 = 0 0 + 5t = 21 + 2 5t = 21 + 2 Combine like terms: 21 + 2 = 23 5t = 23 Divide each side by '5'. t = 4.6 Simplifying t = 4.6
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