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Simplifying 12 + -9x = 129 + -30x Solving 12 + -9x = 129 + -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 = 129 + -30x + 30x Combine like terms: -9x + 30x = 21x 12 + 21x = 129 + -30x + 30x Combine like terms: -30x + 30x = 0 12 + 21x = 129 + 0 12 + 21x = 129 Add '-12' to each side of the equation. 12 + -12 + 21x = 129 + -12 Combine like terms: 12 + -12 = 0 0 + 21x = 129 + -12 21x = 129 + -12 Combine like terms: 129 + -12 = 117 21x = 117 Divide each side by '21'. x = 5.571428571 Simplifying x = 5.571428571
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