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Simplifying 21 + -3t = 4t Solving 21 + -3t = 4t Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-4t' to each side of the equation. 21 + -3t + -4t = 4t + -4t Combine like terms: -3t + -4t = -7t 21 + -7t = 4t + -4t Combine like terms: 4t + -4t = 0 21 + -7t = 0 Add '-21' to each side of the equation. 21 + -21 + -7t = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7t = 0 + -21 -7t = 0 + -21 Combine like terms: 0 + -21 = -21 -7t = -21 Divide each side by '-7'. t = 3 Simplifying t = 3
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