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Simplifying 3x + 4x + -12 = 72 Reorder the terms: -12 + 3x + 4x = 72 Combine like terms: 3x + 4x = 7x -12 + 7x = 72 Solving -12 + 7x = 72 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 = 72 + 12 Combine like terms: -12 + 12 = 0 0 + 7x = 72 + 12 7x = 72 + 12 Combine like terms: 72 + 12 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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