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Simplifying 5x + -8x + -21 = -30 Reorder the terms: -21 + 5x + -8x = -30 Combine like terms: 5x + -8x = -3x -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 = -9 -3x = -9 Divide each side by '-3'. x = 3 Simplifying x = 3
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