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Simplifying 399 = 21(4 + 5x) 399 = (4 * 21 + 5x * 21) 399 = (84 + 105x) Solving 399 = 84 + 105x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-105x' to each side of the equation. 399 + -105x = 84 + 105x + -105x Combine like terms: 105x + -105x = 0 399 + -105x = 84 + 0 399 + -105x = 84 Add '-399' to each side of the equation. 399 + -399 + -105x = 84 + -399 Combine like terms: 399 + -399 = 0 0 + -105x = 84 + -399 -105x = 84 + -399 Combine like terms: 84 + -399 = -315 -105x = -315 Divide each side by '-105'. x = 3 Simplifying x = 3
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