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Simplifying 4t + -1(-1t + 1) = -21 Reorder the terms: 4t + -1(1 + -1t) = -21 4t + (1 * -1 + -1t * -1) = -21 4t + (-1 + 1t) = -21 Reorder the terms: -1 + 4t + 1t = -21 Combine like terms: 4t + 1t = 5t -1 + 5t = -21 Solving -1 + 5t = -21 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 5t = -21 + 1 Combine like terms: -1 + 1 = 0 0 + 5t = -21 + 1 5t = -21 + 1 Combine like terms: -21 + 1 = -20 5t = -20 Divide each side by '5'. t = -4 Simplifying t = -4
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