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Simplifying -12x + -9 = 3x + 7 Reorder the terms: -9 + -12x = 3x + 7 Reorder the terms: -9 + -12x = 7 + 3x Solving -9 + -12x = 7 + 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. -9 + -12x + -3x = 7 + 3x + -3x Combine like terms: -12x + -3x = -15x -9 + -15x = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 -9 + -15x = 7 + 0 -9 + -15x = 7 Add '9' to each side of the equation. -9 + 9 + -15x = 7 + 9 Combine like terms: -9 + 9 = 0 0 + -15x = 7 + 9 -15x = 7 + 9 Combine like terms: 7 + 9 = 16 -15x = 16 Divide each side by '-15'. x = -1.066666667 Simplifying x = -1.066666667
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