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Simplifying 21 = -9 + 6x Solving 21 = -9 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21 + -6x = -9 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -6x = -9 + 0 21 + -6x = -9 Add '-21' to each side of the equation. 21 + -21 + -6x = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = -9 + -21 -6x = -9 + -21 Combine like terms: -9 + -21 = -30 -6x = -30 Divide each side by '-6'. x = 5 Simplifying x = 5
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