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Simplifying 12x + -9x + 7 = 45 Reorder the terms: 7 + 12x + -9x = 45 Combine like terms: 12x + -9x = 3x 7 + 3x = 45 Solving 7 + 3x = 45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 3x = 45 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 45 + -7 3x = 45 + -7 Combine like terms: 45 + -7 = 38 3x = 38 Divide each side by '3'. x = 12.66666667 Simplifying x = 12.66666667
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