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Simplifying 12 + 7x = 4x + -9 Reorder the terms: 12 + 7x = -9 + 4x Solving 12 + 7x = -9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 12 + 7x + -4x = -9 + 4x + -4x Combine like terms: 7x + -4x = 3x 12 + 3x = -9 + 4x + -4x Combine like terms: 4x + -4x = 0 12 + 3x = -9 + 0 12 + 3x = -9 Add '-12' to each side of the equation. 12 + -12 + 3x = -9 + -12 Combine like terms: 12 + -12 = 0 0 + 3x = -9 + -12 3x = -9 + -12 Combine like terms: -9 + -12 = -21 3x = -21 Divide each side by '3'. x = -7 Simplifying x = -7
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