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Simplifying x + 2x + 3x + 4 = 40 Reorder the terms: 4 + x + 2x + 3x = 40 Combine like terms: x + 2x = 3x 4 + 3x + 3x = 40 Combine like terms: 3x + 3x = 6x 4 + 6x = 40 Solving 4 + 6x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 6x = 40 + -4 Combine like terms: 4 + -4 = 0 0 + 6x = 40 + -4 6x = 40 + -4 Combine like terms: 40 + -4 = 36 6x = 36 Divide each side by '6'. x = 6 Simplifying x = 6
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