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Simplifying 9x + -4(x + -3) = 72 Reorder the terms: 9x + -4(-3 + x) = 72 9x + (-3 * -4 + x * -4) = 72 9x + (12 + -4x) = 72 Reorder the terms: 12 + 9x + -4x = 72 Combine like terms: 9x + -4x = 5x 12 + 5x = 72 Solving 12 + 5x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 5x = 72 + -12 Combine like terms: 12 + -12 = 0 0 + 5x = 72 + -12 5x = 72 + -12 Combine like terms: 72 + -12 = 60 5x = 60 Divide each side by '5'. x = 12 Simplifying x = 12

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