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Simplifying 13x + -3(3 + 2x) = 12 13x + (3 * -3 + 2x * -3) = 12 13x + (-9 + -6x) = 12 Reorder the terms: -9 + 13x + -6x = 12 Combine like terms: 13x + -6x = 7x -9 + 7x = 12 Solving -9 + 7x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 7x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 7x = 12 + 9 7x = 12 + 9 Combine like terms: 12 + 9 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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