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Simplifying 12x + -1(7x + -3) = 38 Reorder the terms: 12x + -1(-3 + 7x) = 38 12x + (-3 * -1 + 7x * -1) = 38 12x + (3 + -7x) = 38 Reorder the terms: 3 + 12x + -7x = 38 Combine like terms: 12x + -7x = 5x 3 + 5x = 38 Solving 3 + 5x = 38 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 5x = 38 + -3 Combine like terms: 3 + -3 = 0 0 + 5x = 38 + -3 5x = 38 + -3 Combine like terms: 38 + -3 = 35 5x = 35 Divide each side by '5'. x = 7 Simplifying x = 7
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