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Simplifying 2x + 21 = 12x + -99 Reorder the terms: 21 + 2x = 12x + -99 Reorder the terms: 21 + 2x = -99 + 12x Solving 21 + 2x = -99 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 21 + 2x + -12x = -99 + 12x + -12x Combine like terms: 2x + -12x = -10x 21 + -10x = -99 + 12x + -12x Combine like terms: 12x + -12x = 0 21 + -10x = -99 + 0 21 + -10x = -99 Add '-21' to each side of the equation. 21 + -21 + -10x = -99 + -21 Combine like terms: 21 + -21 = 0 0 + -10x = -99 + -21 -10x = -99 + -21 Combine like terms: -99 + -21 = -120 -10x = -120 Divide each side by '-10'. x = 12 Simplifying x = 12
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