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Simplifying (7t + -21) + (t + -4) = 15 Reorder the terms: (-21 + 7t) + (t + -4) = 15 Remove parenthesis around (-21 + 7t) -21 + 7t + (t + -4) = 15 Reorder the terms: -21 + 7t + (-4 + t) = 15 Remove parenthesis around (-4 + t) -21 + 7t + -4 + t = 15 Reorder the terms: -21 + -4 + 7t + t = 15 Combine like terms: -21 + -4 = -25 -25 + 7t + t = 15 Combine like terms: 7t + t = 8t -25 + 8t = 15 Solving -25 + 8t = 15 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + 8t = 15 + 25 Combine like terms: -25 + 25 = 0 0 + 8t = 15 + 25 8t = 15 + 25 Combine like terms: 15 + 25 = 40 8t = 40 Divide each side by '8'. t = 5 Simplifying t = 5
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