(40-40x)x+40x=40-32.4

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(40-40x)x+40x=40-32.4
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(40-40x)x+40x=40-32.4
(40-40x)x+40x=40-32.4

(40-40x)x+40x=40-32.4
40x-40x2+40x=7.8
40x2-80x+7.8=0