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Simplifying 7x + -1(2x + 3) = 12 Reorder the terms: 7x + -1(3 + 2x) = 12 7x + (3 * -1 + 2x * -1) = 12 7x + (-3 + -2x) = 12 Reorder the terms: -3 + 7x + -2x = 12 Combine like terms: 7x + -2x = 5x -3 + 5x = 12 Solving -3 + 5x = 12 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 = 12 + 3 Combine like terms: -3 + 3 = 0 0 + 5x = 12 + 3 5x = 12 + 3 Combine like terms: 12 + 3 = 15 5x = 15 Divide each side by '5'. x = 3 Simplifying x = 3
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