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Simplifying -21 = 5x + -5 + 4 Reorder the terms: -21 = -5 + 4 + 5x Combine like terms: -5 + 4 = -1 -21 = -1 + 5x Solving -21 = -1 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -21 + -5x = -1 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -5x = -1 + 0 -21 + -5x = -1 Add '21' to each side of the equation. -21 + 21 + -5x = -1 + 21 Combine like terms: -21 + 21 = 0 0 + -5x = -1 + 21 -5x = -1 + 21 Combine like terms: -1 + 21 = 20 -5x = 20 Divide each side by '-5'. x = -4 Simplifying x = -4
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