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Simplifying 13 + x + 13 + x = 20 + x + 3x Reorder the terms: 13 + 13 + x + x = 20 + x + 3x Combine like terms: 13 + 13 = 26 26 + x + x = 20 + x + 3x Combine like terms: x + x = 2x 26 + 2x = 20 + x + 3x Combine like terms: x + 3x = 4x 26 + 2x = 20 + 4x Solving 26 + 2x = 20 + 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. 26 + 2x + -4x = 20 + 4x + -4x Combine like terms: 2x + -4x = -2x 26 + -2x = 20 + 4x + -4x Combine like terms: 4x + -4x = 0 26 + -2x = 20 + 0 26 + -2x = 20 Add '-26' to each side of the equation. 26 + -26 + -2x = 20 + -26 Combine like terms: 26 + -26 = 0 0 + -2x = 20 + -26 -2x = 20 + -26 Combine like terms: 20 + -26 = -6 -2x = -6 Divide each side by '-2'. x = 3 Simplifying x = 3
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