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Simplifying 200 + 0.40x = 8400 Solving 200 + 0.40x = 8400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-200' to each side of the equation. 200 + -200 + 0.40x = 8400 + -200 Combine like terms: 200 + -200 = 0 0 + 0.40x = 8400 + -200 0.40x = 8400 + -200 Combine like terms: 8400 + -200 = 8200 0.40x = 8200 Divide each side by '0.40'. x = 20500 Simplifying x = 20500
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