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Simplifying 3x + 12 + -6x = 21 Reorder the terms: 12 + 3x + -6x = 21 Combine like terms: 3x + -6x = -3x 12 + -3x = 21 Solving 12 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -3x = 21 + -12 -3x = 21 + -12 Combine like terms: 21 + -12 = 9 -3x = 9 Divide each side by '-3'. x = -3 Simplifying x = -3
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