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Simplifying 3.9 * 4.2 = 4.1x Multiply 3.9 * 4.2 16.38 = 4.1x Solving 16.38 = 4.1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.1x' to each side of the equation. 16.38 + -4.1x = 4.1x + -4.1x Combine like terms: 4.1x + -4.1x = 0.0 16.38 + -4.1x = 0.0 Add '-16.38' to each side of the equation. 16.38 + -16.38 + -4.1x = 0.0 + -16.38 Combine like terms: 16.38 + -16.38 = 0.00 0.00 + -4.1x = 0.0 + -16.38 -4.1x = 0.0 + -16.38 Combine like terms: 0.0 + -16.38 = -16.38 -4.1x = -16.38 Divide each side by '-4.1'. x = 3.995121951 Simplifying x = 3.995121951
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