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Simplifying 9 + -9x = 72 + 12x Solving 9 + -9x = 72 + 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. 9 + -9x + -12x = 72 + 12x + -12x Combine like terms: -9x + -12x = -21x 9 + -21x = 72 + 12x + -12x Combine like terms: 12x + -12x = 0 9 + -21x = 72 + 0 9 + -21x = 72 Add '-9' to each side of the equation. 9 + -9 + -21x = 72 + -9 Combine like terms: 9 + -9 = 0 0 + -21x = 72 + -9 -21x = 72 + -9 Combine like terms: 72 + -9 = 63 -21x = 63 Divide each side by '-21'. x = -3 Simplifying x = -3
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