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Simplifying -4(7) + 7t = 21t Multiply -4 * 7 -28 + 7t = 21t Solving -28 + 7t = 21t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-21t' to each side of the equation. -28 + 7t + -21t = 21t + -21t Combine like terms: 7t + -21t = -14t -28 + -14t = 21t + -21t Combine like terms: 21t + -21t = 0 -28 + -14t = 0 Add '28' to each side of the equation. -28 + 28 + -14t = 0 + 28 Combine like terms: -28 + 28 = 0 0 + -14t = 0 + 28 -14t = 0 + 28 Combine like terms: 0 + 28 = 28 -14t = 28 Divide each side by '-14'. t = -2 Simplifying t = -2
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