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Simplifying 81 = [t + -1(-4)] + 11 Multiply -1 * -4 81 = [t + 4] + 11 Reorder the terms: 81 = [4 + t] + 11 Remove brackets around [4 + t] 81 = 4 + t + 11 Reorder the terms: 81 = 4 + 11 + t Combine like terms: 4 + 11 = 15 81 = 15 + t Solving 81 = 15 + t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1t' to each side of the equation. 81 + -1t = 15 + t + -1t Combine like terms: t + -1t = 0 81 + -1t = 15 + 0 81 + -1t = 15 Add '-81' to each side of the equation. 81 + -81 + -1t = 15 + -81 Combine like terms: 81 + -81 = 0 0 + -1t = 15 + -81 -1t = 15 + -81 Combine like terms: 15 + -81 = -66 -1t = -66 Divide each side by '-1'. t = 66 Simplifying t = 66
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