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Simplifying x + 3x + 40 + 3x = 180 Reorder the terms: 40 + x + 3x + 3x = 180 Combine like terms: x + 3x = 4x 40 + 4x + 3x = 180 Combine like terms: 4x + 3x = 7x 40 + 7x = 180 Solving 40 + 7x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 7x = 180 + -40 Combine like terms: 40 + -40 = 0 0 + 7x = 180 + -40 7x = 180 + -40 Combine like terms: 180 + -40 = 140 7x = 140 Divide each side by '7'. x = 20 Simplifying x = 20
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