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Simplifying 9x + -4(4x + 5) = 40 Reorder the terms: 9x + -4(5 + 4x) = 40 9x + (5 * -4 + 4x * -4) = 40 9x + (-20 + -16x) = 40 Reorder the terms: -20 + 9x + -16x = 40 Combine like terms: 9x + -16x = -7x -20 + -7x = 40 Solving -20 + -7x = 40 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 = 40 + 20 Combine like terms: -20 + 20 = 0 0 + -7x = 40 + 20 -7x = 40 + 20 Combine like terms: 40 + 20 = 60 -7x = 60 Divide each side by '-7'. x = -8.571428571 Simplifying x = -8.571428571
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