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Simplifying 21 + 3t = 9 + -3t Solving 21 + 3t = 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 + 3t + 3t = 9 + -3t + 3t Combine like terms: 3t + 3t = 6t 21 + 6t = 9 + -3t + 3t Combine like terms: -3t + 3t = 0 21 + 6t = 9 + 0 21 + 6t = 9 Add '-21' to each side of the equation. 21 + -21 + 6t = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 6t = 9 + -21 6t = 9 + -21 Combine like terms: 9 + -21 = -12 6t = -12 Divide each side by '6'. t = -2 Simplifying t = -2
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