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Simplifying 3x = x + -1(12 + 2x) 3x = x + (12 * -1 + 2x * -1) 3x = x + (-12 + -2x) Reorder the terms: 3x = -12 + x + -2x Combine like terms: x + -2x = -1x 3x = -12 + -1x Solving 3x = -12 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 3x + x = -12 + -1x + x Combine like terms: 3x + x = 4x 4x = -12 + -1x + x Combine like terms: -1x + x = 0 4x = -12 + 0 4x = -12 Divide each side by '4'. x = -3 Simplifying x = -3
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