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Simplifying x + 3x = 21 + -3x Combine like terms: x + 3x = 4x 4x = 21 + -3x Solving 4x = 21 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 4x + 3x = 21 + -3x + 3x Combine like terms: 4x + 3x = 7x 7x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 7x = 21 + 0 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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