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Simplifying 12.9 = X + 7 Reorder the terms: 12.9 = 7 + X Solving 12.9 = 7 + X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1X' to each side of the equation. 12.9 + -1X = 7 + X + -1X Combine like terms: X + -1X = 0 12.9 + -1X = 7 + 0 12.9 + -1X = 7 Add '-12.9' to each side of the equation. 12.9 + -12.9 + -1X = 7 + -12.9 Combine like terms: 12.9 + -12.9 = 0.0 0.0 + -1X = 7 + -12.9 -1X = 7 + -12.9 Combine like terms: 7 + -12.9 = -5.9 -1X = -5.9 Divide each side by '-1'. X = 5.9 Simplifying X = 5.9
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