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Simplifying 3x + 4x + 15 = 120 Reorder the terms: 15 + 3x + 4x = 120 Combine like terms: 3x + 4x = 7x 15 + 7x = 120 Solving 15 + 7x = 120 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 7x = 120 + -15 Combine like terms: 15 + -15 = 0 0 + 7x = 120 + -15 7x = 120 + -15 Combine like terms: 120 + -15 = 105 7x = 105 Divide each side by '7'. x = 15 Simplifying x = 15
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