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Simplifying 20t + 81 = 10t + 121 Reorder the terms: 81 + 20t = 10t + 121 Reorder the terms: 81 + 20t = 121 + 10t Solving 81 + 20t = 121 + 10t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-10t' to each side of the equation. 81 + 20t + -10t = 121 + 10t + -10t Combine like terms: 20t + -10t = 10t 81 + 10t = 121 + 10t + -10t Combine like terms: 10t + -10t = 0 81 + 10t = 121 + 0 81 + 10t = 121 Add '-81' to each side of the equation. 81 + -81 + 10t = 121 + -81 Combine like terms: 81 + -81 = 0 0 + 10t = 121 + -81 10t = 121 + -81 Combine like terms: 121 + -81 = 40 10t = 40 Divide each side by '10'. t = 4 Simplifying t = 4
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