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Simplifying 21 = 3x + -6x Combine like terms: 3x + -6x = -3x 21 = -3x Solving 21 = -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + 3x = -3x + 3x Combine like terms: -3x + 3x = 0 21 + 3x = 0 Add '-21' to each side of the equation. 21 + -21 + 3x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 0 + -21 3x = 0 + -21 Combine like terms: 0 + -21 = -21 3x = -21 Divide each side by '3'. x = -7 Simplifying x = -7
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