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Simplifying 15 = -3t + 21x Solving 15 = -3t + 21x Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3t' to each side of the equation. 15 + 3t = -3t + 3t + 21x Combine like terms: -3t + 3t = 0 15 + 3t = 0 + 21x 15 + 3t = 21x Add '-15' to each side of the equation. 15 + -15 + 3t = -15 + 21x Combine like terms: 15 + -15 = 0 0 + 3t = -15 + 21x 3t = -15 + 21x Divide each side by '3'. t = -5 + 7x Simplifying t = -5 + 7x
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