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Simplifying 4.2 = -2x Solving 4.2 = -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 4.2 + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 4.2 + 2x = 0 Add '-4.2' to each side of the equation. 4.2 + -4.2 + 2x = 0 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + 2x = 0 + -4.2 2x = 0 + -4.2 Combine like terms: 0 + -4.2 = -4.2 2x = -4.2 Divide each side by '2'. x = -2.1 Simplifying x = -2.1
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