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Simplifying 4x + 21x + 30 = 0 Reorder the terms: 30 + 4x + 21x = 0 Combine like terms: 4x + 21x = 25x 30 + 25x = 0 Solving 30 + 25x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 25x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + 25x = 0 + -30 25x = 0 + -30 Combine like terms: 0 + -30 = -30 25x = -30 Divide each side by '25'. x = -1.2 Simplifying x = -1.2
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