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Simplifying 0.06x + 0.08(18000 + -1x) = 1290 0.06x + (18000 * 0.08 + -1x * 0.08) = 1290 0.06x + (1440 + -0.08x) = 1290 Reorder the terms: 1440 + 0.06x + -0.08x = 1290 Combine like terms: 0.06x + -0.08x = -0.02x 1440 + -0.02x = 1290 Solving 1440 + -0.02x = 1290 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1440' to each side of the equation. 1440 + -1440 + -0.02x = 1290 + -1440 Combine like terms: 1440 + -1440 = 0 0 + -0.02x = 1290 + -1440 -0.02x = 1290 + -1440 Combine like terms: 1290 + -1440 = -150 -0.02x = -150 Divide each side by '-0.02'. x = 7500 Simplifying x = 7500

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