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Simplifying -21 = t + 18 Reorder the terms: -21 = 18 + t Solving -21 = 18 + t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1t' to each side of the equation. -21 + -1t = 18 + t + -1t Combine like terms: t + -1t = 0 -21 + -1t = 18 + 0 -21 + -1t = 18 Add '21' to each side of the equation. -21 + 21 + -1t = 18 + 21 Combine like terms: -21 + 21 = 0 0 + -1t = 18 + 21 -1t = 18 + 21 Combine like terms: 18 + 21 = 39 -1t = 39 Divide each side by '-1'. t = -39 Simplifying t = -39
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