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Simplifying x + 3x + 15 = 91 Reorder the terms: 15 + x + 3x = 91 Combine like terms: x + 3x = 4x 15 + 4x = 91 Solving 15 + 4x = 91 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 + 4x = 91 + -15 Combine like terms: 15 + -15 = 0 0 + 4x = 91 + -15 4x = 91 + -15 Combine like terms: 91 + -15 = 76 4x = 76 Divide each side by '4'. x = 19 Simplifying x = 19
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