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Simplifying 8t + -21 = 15 + 4t Reorder the terms: -21 + 8t = 15 + 4t Solving -21 + 8t = 15 + 4t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-4t' to each side of the equation. -21 + 8t + -4t = 15 + 4t + -4t Combine like terms: 8t + -4t = 4t -21 + 4t = 15 + 4t + -4t Combine like terms: 4t + -4t = 0 -21 + 4t = 15 + 0 -21 + 4t = 15 Add '21' to each side of the equation. -21 + 21 + 4t = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 4t = 15 + 21 4t = 15 + 21 Combine like terms: 15 + 21 = 36 4t = 36 Divide each side by '4'. t = 9 Simplifying t = 9
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