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Simplifying 3x + 20 + 3x + 20 = 4x + 80 Reorder the terms: 20 + 20 + 3x + 3x = 4x + 80 Combine like terms: 20 + 20 = 40 40 + 3x + 3x = 4x + 80 Combine like terms: 3x + 3x = 6x 40 + 6x = 4x + 80 Reorder the terms: 40 + 6x = 80 + 4x Solving 40 + 6x = 80 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 40 + 6x + -4x = 80 + 4x + -4x Combine like terms: 6x + -4x = 2x 40 + 2x = 80 + 4x + -4x Combine like terms: 4x + -4x = 0 40 + 2x = 80 + 0 40 + 2x = 80 Add '-40' to each side of the equation. 40 + -40 + 2x = 80 + -40 Combine like terms: 40 + -40 = 0 0 + 2x = 80 + -40 2x = 80 + -40 Combine like terms: 80 + -40 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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