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Simplifying 9x + -1(4x + -12) = 42 Reorder the terms: 9x + -1(-12 + 4x) = 42 9x + (-12 * -1 + 4x * -1) = 42 9x + (12 + -4x) = 42 Reorder the terms: 12 + 9x + -4x = 42 Combine like terms: 9x + -4x = 5x 12 + 5x = 42 Solving 12 + 5x = 42 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 = 42 + -12 Combine like terms: 12 + -12 = 0 0 + 5x = 42 + -12 5x = 42 + -12 Combine like terms: 42 + -12 = 30 5x = 30 Divide each side by '5'. x = 6 Simplifying x = 6
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