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Simplifying 21t + -490 = 10t + 980 Reorder the terms: -490 + 21t = 10t + 980 Reorder the terms: -490 + 21t = 980 + 10t Solving -490 + 21t = 980 + 10t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-10t' to each side of the equation. -490 + 21t + -10t = 980 + 10t + -10t Combine like terms: 21t + -10t = 11t -490 + 11t = 980 + 10t + -10t Combine like terms: 10t + -10t = 0 -490 + 11t = 980 + 0 -490 + 11t = 980 Add '490' to each side of the equation. -490 + 490 + 11t = 980 + 490 Combine like terms: -490 + 490 = 0 0 + 11t = 980 + 490 11t = 980 + 490 Combine like terms: 980 + 490 = 1470 11t = 1470 Divide each side by '11'. t = 133.6363636 Simplifying t = 133.6363636
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