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Simplifying 84 = -21x Solving 84 = -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 84 + 21x = -21x + 21x Combine like terms: -21x + 21x = 0 84 + 21x = 0 Add '-84' to each side of the equation. 84 + -84 + 21x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 21x = 0 + -84 21x = 0 + -84 Combine like terms: 0 + -84 = -84 21x = -84 Divide each side by '21'. x = -4 Simplifying x = -4
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