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Simplifying 7x + 9 = 12 + 4x Reorder the terms: 9 + 7x = 12 + 4x Solving 9 + 7x = 12 + 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. 9 + 7x + -4x = 12 + 4x + -4x Combine like terms: 7x + -4x = 3x 9 + 3x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 9 + 3x = 12 + 0 9 + 3x = 12 Add '-9' to each side of the equation. 9 + -9 + 3x = 12 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 12 + -9 3x = 12 + -9 Combine like terms: 12 + -9 = 3 3x = 3 Divide each side by '3'. x = 1 Simplifying x = 1
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