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Simplifying 21 + -6x = 12 + -3x Solving 21 + -6x = 12 + -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 + -6x + 3x = 12 + -3x + 3x Combine like terms: -6x + 3x = -3x 21 + -3x = 12 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + -3x = 12 + 0 21 + -3x = 12 Add '-21' to each side of the equation. 21 + -21 + -3x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 12 + -21 -3x = 12 + -21 Combine like terms: 12 + -21 = -9 -3x = -9 Divide each side by '-3'. x = 3 Simplifying x = 3
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