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I'm tired of this equation. . . .
First, lose weight. First, divide both sides by 20.

4 * 200+(80-X)( 10+X)+2(400-20X)-50 * 40 = 600

800+800-x？ +70x+800-40x-2000=600

-x？ +30x=600-2400=- 1800

x？ -30x- 1800=0

(x-60)(x+30)=0

X=60 or x=-30.

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