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45x➗;(x-0.8)=50 9x(x-0.8)=10 9x^2-7.2x=10 x^2-0.8x=10/9 (x-0.4)^2=10/9+0.16=11.44/9 x-0.4=±√11.44/3 x1=0.4+√11.44 x2=0.4-√11.44 .
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