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Simplifying 3x + 21(x + -4) = 66 Reorder the terms: 3x + 21(-4 + x) = 66 3x + (-4 * 21 + x * 21) = 66 3x + (-84 + 21x) = 66 Reorder the terms: -84 + 3x + 21x = 66 Combine like terms: 3x + 21x = 24x -84 + 24x = 66 Solving -84 + 24x = 66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + 24x = 66 + 84 Combine like terms: -84 + 84 = 0 0 + 24x = 66 + 84 24x = 66 + 84 Combine like terms: 66 + 84 = 150 24x = 150 Divide each side by '24'. x = 6.25 Simplifying x = 6.25
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