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Simplifying -7(2t + 7) = -21 Reorder the terms: -7(7 + 2t) = -21 (7 * -7 + 2t * -7) = -21 (-49 + -14t) = -21 Solving -49 + -14t = -21 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + -14t = -21 + 49 Combine like terms: -49 + 49 = 0 0 + -14t = -21 + 49 -14t = -21 + 49 Combine like terms: -21 + 49 = 28 -14t = 28 Divide each side by '-14'. t = -2 Simplifying t = -2
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