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    (16/9)*t^2=(16/25)*t^2+((24/5)-(2/5)*t)^2
    200x+2=150x*2
    x²+x-40000
    x^2-180x+8000=2400
    -0.5x^2+30x+2000=2400
    2x+5(30-x)=90
    1/(3-x^2)
    15000-10X+200(70-X)+80(10+X)=25900
    80×[20(1+a%)-15]+120×[30(1-a%)—(20-3)]=1600十260
    x^2*14+23x-71=0
    x+(1-x)x+(1-x-(1-x)x)x=0.6
    (6-d)(14+d)=64
    (4-d)(12+d)=25
    (1+x)^2*0.4+0.5(1+x)(1+2x) = 8
    0.4(1+x)^2+0.5(1+x)(1+2x) = 8
    (1+x)^2*0.4+0.5(1+x)(1+2x)=8
    (4-d)(12+d)=36
    140X+150(100-X)
    (4-d)(12+d)
    x^2+16x-48

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