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Simplifying (5x + -21) = 0 Reorder the terms: (-21 + 5x) = 0 Remove parenthesis around (-21 + 5x) -21 + 5x = 0 Solving -21 + 5x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 5x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 5x = 0 + 21 5x = 0 + 21 Combine like terms: 0 + 21 = 21 5x = 21 Divide each side by '5'. x = 4.2 Simplifying x = 4.2
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