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Simplifying 7t + -21 = 2t Reorder the terms: -21 + 7t = 2t Solving -21 + 7t = 2t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2t' to each side of the equation. -21 + 7t + -2t = 2t + -2t Combine like terms: 7t + -2t = 5t -21 + 5t = 2t + -2t Combine like terms: 2t + -2t = 0 -21 + 5t = 0 Add '21' to each side of the equation. -21 + 21 + 5t = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 5t = 0 + 21 5t = 0 + 21 Combine like terms: 0 + 21 = 21 5t = 21 Divide each side by '5'. t = 4.2 Simplifying t = 4.2
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