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Simplifying 7x + -4 + -9x + 12 = 0 Reorder the terms: -4 + 12 + 7x + -9x = 0 Combine like terms: -4 + 12 = 8 8 + 7x + -9x = 0 Combine like terms: 7x + -9x = -2x 8 + -2x = 0 Solving 8 + -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -2x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -2x = 0 + -8 -2x = 0 + -8 Combine like terms: 0 + -8 = -8 -2x = -8 Divide each side by '-2'. x = 4 Simplifying x = 4
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