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Simplifying 21 = 0.8t Solving 21 = 0.8t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.8t' to each side of the equation. 21 + -0.8t = 0.8t + -0.8t Combine like terms: 0.8t + -0.8t = 0.0 21 + -0.8t = 0.0 Add '-21' to each side of the equation. 21 + -21 + -0.8t = 0.0 + -21 Combine like terms: 21 + -21 = 0 0 + -0.8t = 0.0 + -21 -0.8t = 0.0 + -21 Combine like terms: 0.0 + -21 = -21 -0.8t = -21 Divide each side by '-0.8'. t = 26.25 Simplifying t = 26.25
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