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Simplifying 21 + -1 = t Combine like terms: 21 + -1 = 20 20 = t Solving 20 = 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. 20 + -1t = t + -1t Combine like terms: t + -1t = 0 20 + -1t = 0 Add '-20' to each side of the equation. 20 + -20 + -1t = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -1t = 0 + -20 -1t = 0 + -20 Combine like terms: 0 + -20 = -20 -1t = -20 Divide each side by '-1'. t = 20 Simplifying t = 20
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