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Simplifying 21x = 39(2 + -1x) 21x = (2 * 39 + -1x * 39) 21x = (78 + -39x) Solving 21x = 78 + -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. 21x + 39x = 78 + -39x + 39x Combine like terms: 21x + 39x = 60x 60x = 78 + -39x + 39x Combine like terms: -39x + 39x = 0 60x = 78 + 0 60x = 78 Divide each side by '60'. x = 1.3 Simplifying x = 1.3
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