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Simplifying X + 3x = 420 Solving X + 3x = 420 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. X + 3x + -3x = 420 + -3x Combine like terms: 3x + -3x = 0 X + 0 = 420 + -3x X = 420 + -3x Simplifying X = 420 + -3x
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