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Simplifying 7.99 = 0.4x + 4.39 Reorder the terms: 7.99 = 4.39 + 0.4x Solving 7.99 = 4.39 + 0.4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4x' to each side of the equation. 7.99 + -0.4x = 4.39 + 0.4x + -0.4x Combine like terms: 0.4x + -0.4x = 0.0 7.99 + -0.4x = 4.39 + 0.0 7.99 + -0.4x = 4.39 Add '-7.99' to each side of the equation. 7.99 + -7.99 + -0.4x = 4.39 + -7.99 Combine like terms: 7.99 + -7.99 = 0.00 0.00 + -0.4x = 4.39 + -7.99 -0.4x = 4.39 + -7.99 Combine like terms: 4.39 + -7.99 = -3.6 -0.4x = -3.6 Divide each side by '-0.4'. x = 9 Simplifying x = 9
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