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Simplifying -4.2 = 3x + 31.8 Reorder the terms: -4.2 = 31.8 + 3x Solving -4.2 = 31.8 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -4.2 + -3x = 31.8 + 3x + -3x Combine like terms: 3x + -3x = 0 -4.2 + -3x = 31.8 + 0 -4.2 + -3x = 31.8 Add '4.2' to each side of the equation. -4.2 + 4.2 + -3x = 31.8 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + -3x = 31.8 + 4.2 -3x = 31.8 + 4.2 Combine like terms: 31.8 + 4.2 = 36 -3x = 36 Divide each side by '-3'. x = -12 Simplifying x = -12
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