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Simplifying 2x + -3(-4 + 3x) = -9 2x + (-4 * -3 + 3x * -3) = -9 2x + (12 + -9x) = -9 Reorder the terms: 12 + 2x + -9x = -9 Combine like terms: 2x + -9x = -7x 12 + -7x = -9 Solving 12 + -7x = -9 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 + -7x = -9 + -12 Combine like terms: 12 + -12 = 0 0 + -7x = -9 + -12 -7x = -9 + -12 Combine like terms: -9 + -12 = -21 -7x = -21 Divide each side by '-7'. x = 3 Simplifying x = 3
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