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Simplifying 1.8x + 20.4 = 4.2x Reorder the terms: 20.4 + 1.8x = 4.2x Solving 20.4 + 1.8x = 4.2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.2x' to each side of the equation. 20.4 + 1.8x + -4.2x = 4.2x + -4.2x Combine like terms: 1.8x + -4.2x = -2.4x 20.4 + -2.4x = 4.2x + -4.2x Combine like terms: 4.2x + -4.2x = 0.0 20.4 + -2.4x = 0.0 Add '-20.4' to each side of the equation. 20.4 + -20.4 + -2.4x = 0.0 + -20.4 Combine like terms: 20.4 + -20.4 = 0.0 0.0 + -2.4x = 0.0 + -20.4 -2.4x = 0.0 + -20.4 Combine like terms: 0.0 + -20.4 = -20.4 -2.4x = -20.4 Divide each side by '-2.4'. x = 8.5 Simplifying x = 8.5
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