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    2X-50=110
    x/12.1-154/11=3
     (70+5y)/12.1-60/11=1
     (70+5y)/12.1-60/11=1
    10x+10x×10%+90%×10×(200-x)=1960
    10x+10x×10%+90%×10×(200-x)
    3n²+n=4734
    x=1+x
    x=1
    x=x
    2x×X=√3
    5(2x-10)(x-10)=3000
    2x×x=
    n∧2+2n-34.81=0
    X*49%=X(20%+8%)+121340
    80+X=(575-450)+X*25%
    5.2x+7.6(14-x)=87.2
    x-(x*10%)-2706071.41=0
    x-(x*10%)=2706071.41
    (8*x+60)/5-(7*x-10)/4=10

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