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Simplifying 12 + -9x = 84 + -30x Solving 12 + -9x = 84 + -30x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30x' to each side of the equation. 12 + -9x + 30x = 84 + -30x + 30x Combine like terms: -9x + 30x = 21x 12 + 21x = 84 + -30x + 30x Combine like terms: -30x + 30x = 0 12 + 21x = 84 + 0 12 + 21x = 84 Add '-12' to each side of the equation. 12 + -12 + 21x = 84 + -12 Combine like terms: 12 + -12 = 0 0 + 21x = 84 + -12 21x = 84 + -12 Combine like terms: 84 + -12 = 72 21x = 72 Divide each side by '21'. x = 3.428571429 Simplifying x = 3.428571429
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