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