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Simplifying -21(3t) = 0 Remove parenthesis around (3t) -21 * 3t = 0 Multiply -21 * 3 -63t = 0 Solving -63t = 0 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Divide each side by '-63'. t = 0 Simplifying t = 0
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