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Simplifying 3 + 78 = 39x + 21 Combine like terms: 3 + 78 = 81 81 = 39x + 21 Reorder the terms: 81 = 21 + 39x Solving 81 = 21 + 39x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39x' to each side of the equation. 81 + -39x = 21 + 39x + -39x Combine like terms: 39x + -39x = 0 81 + -39x = 21 + 0 81 + -39x = 21 Add '-81' to each side of the equation. 81 + -81 + -39x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -39x = 21 + -81 -39x = 21 + -81 Combine like terms: 21 + -81 = -60 -39x = -60 Divide each side by '-39'. x = 1.538461538 Simplifying x = 1.538461538
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