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Simplifying -4.2x + 31.5 = 0 Reorder the terms: 31.5 + -4.2x = 0 Solving 31.5 + -4.2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-31.5' to each side of the equation. 31.5 + -31.5 + -4.2x = 0 + -31.5 Combine like terms: 31.5 + -31.5 = 0.0 0.0 + -4.2x = 0 + -31.5 -4.2x = 0 + -31.5 Combine like terms: 0 + -31.5 = -31.5 -4.2x = -31.5 Divide each side by '-4.2'. x = 7.5 Simplifying x = 7.5
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