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Simplifying -21 + 3x = 30 Solving -21 + 3x = 30 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 + 3x = 30 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 30 + 21 3x = 30 + 21 Combine like terms: 30 + 21 = 51 3x = 51 Divide each side by '3'. x = 17 Simplifying x = 17
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