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Simplifying 3x + 4x + 15 = 36 Reorder the terms: 15 + 3x + 4x = 36 Combine like terms: 3x + 4x = 7x 15 + 7x = 36 Solving 15 + 7x = 36 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 = 36 + -15 Combine like terms: 15 + -15 = 0 0 + 7x = 36 + -15 7x = 36 + -15 Combine like terms: 36 + -15 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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