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Simplifying 3x + x = x + 12 + x + 3 Combine like terms: 3x + x = 4x 4x = x + 12 + x + 3 Reorder the terms: 4x = 12 + 3 + x + x Combine like terms: 12 + 3 = 15 4x = 15 + x + x Combine like terms: x + x = 2x 4x = 15 + 2x Solving 4x = 15 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 4x + -2x = 15 + 2x + -2x Combine like terms: 4x + -2x = 2x 2x = 15 + 2x + -2x Combine like terms: 2x + -2x = 0 2x = 15 + 0 2x = 15 Divide each side by '2'. x = 7.5 Simplifying x = 7.5
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