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Simplifying -12 + 9 = -9x + 15 Combine like terms: -12 + 9 = -3 -3 = -9x + 15 Reorder the terms: -3 = 15 + -9x Solving -3 = 15 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -3 + 9x = 15 + -9x + 9x Combine like terms: -9x + 9x = 0 -3 + 9x = 15 + 0 -3 + 9x = 15 Add '3' to each side of the equation. -3 + 3 + 9x = 15 + 3 Combine like terms: -3 + 3 = 0 0 + 9x = 15 + 3 9x = 15 + 3 Combine like terms: 15 + 3 = 18 9x = 18 Divide each side by '9'. x = 2 Simplifying x = 2
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