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Simplifying 21x = 14(x + 4) Reorder the terms: 21x = 14(4 + x) 21x = (4 * 14 + x * 14) 21x = (56 + 14x) Solving 21x = 56 + 14x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14x' to each side of the equation. 21x + -14x = 56 + 14x + -14x Combine like terms: 21x + -14x = 7x 7x = 56 + 14x + -14x Combine like terms: 14x + -14x = 0 7x = 56 + 0 7x = 56 Divide each side by '7'. x = 8 Simplifying x = 8
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