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Simplifying 12x + -5(x + 4) = 20 Reorder the terms: 12x + -5(4 + x) = 20 12x + (4 * -5 + x * -5) = 20 12x + (-20 + -5x) = 20 Reorder the terms: -20 + 12x + -5x = 20 Combine like terms: 12x + -5x = 7x -20 + 7x = 20 Solving -20 + 7x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 7x = 20 + 20 Combine like terms: -20 + 20 = 0 0 + 7x = 20 + 20 7x = 20 + 20 Combine like terms: 20 + 20 = 40 7x = 40 Divide each side by '7'. x = 5.714285714 Simplifying x = 5.714285714
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