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Simplifying 84 = -21t Solving 84 = -21t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '21t' to each side of the equation. 84 + 21t = -21t + 21t Combine like terms: -21t + 21t = 0 84 + 21t = 0 Add '-84' to each side of the equation. 84 + -84 + 21t = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 21t = 0 + -84 21t = 0 + -84 Combine like terms: 0 + -84 = -84 21t = -84 Divide each side by '21'. t = -4 Simplifying t = -4
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