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Simplifying 9t + -21 = 3(t + -7) + t Reorder the terms: -21 + 9t = 3(t + -7) + t Reorder the terms: -21 + 9t = 3(-7 + t) + t -21 + 9t = (-7 * 3 + t * 3) + t -21 + 9t = (-21 + 3t) + t Combine like terms: 3t + t = 4t -21 + 9t = -21 + 4t Add '21' to each side of the equation. -21 + 21 + 9t = -21 + 21 + 4t Combine like terms: -21 + 21 = 0 0 + 9t = -21 + 21 + 4t 9t = -21 + 21 + 4t Combine like terms: -21 + 21 = 0 9t = 0 + 4t 9t = 4t Solving 9t = 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. 9t + -4t = 4t + -4t Combine like terms: 9t + -4t = 5t 5t = 4t + -4t Combine like terms: 4t + -4t = 0 5t = 0 Divide each side by '5'. t = 0 Simplifying t = 0
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