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Simplifying 3 + 78x = 39x + 21 Reorder the terms: 3 + 78x = 21 + 39x Solving 3 + 78x = 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. 3 + 78x + -39x = 21 + 39x + -39x Combine like terms: 78x + -39x = 39x 3 + 39x = 21 + 39x + -39x Combine like terms: 39x + -39x = 0 3 + 39x = 21 + 0 3 + 39x = 21 Add '-3' to each side of the equation. 3 + -3 + 39x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 39x = 21 + -3 39x = 21 + -3 Combine like terms: 21 + -3 = 18 39x = 18 Divide each side by '39'. x = 0.4615384615 Simplifying x = 0.4615384615
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