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Simplifying 12 + -9x = -3x + -30 Reorder the terms: 12 + -9x = -30 + -3x Solving 12 + -9x = -30 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 12 + -9x + 3x = -30 + -3x + 3x Combine like terms: -9x + 3x = -6x 12 + -6x = -30 + -3x + 3x Combine like terms: -3x + 3x = 0 12 + -6x = -30 + 0 12 + -6x = -30 Add '-12' to each side of the equation. 12 + -12 + -6x = -30 + -12 Combine like terms: 12 + -12 = 0 0 + -6x = -30 + -12 -6x = -30 + -12 Combine like terms: -30 + -12 = -42 -6x = -42 Divide each side by '-6'. x = 7 Simplifying x = 7
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