(2y-1)/4=1-(3-y)/8
    x/3-(x-1)/5=1
    (3x+5)/2=(7x-5)/3
    (3x+5)/2=(7x-5)/3
    (3x+5)/2=(7x-5)/3
    sin(x)sin(2/3π-x)=1/3
    abs（x^3+x）/√（x^2-1）
    {[(x-55)/45]^2}*15.9=15.81
    (x＋2)×4＝(x-2)×5
    x^2/(5*10^(-3) -x)=6.761*10^-5
    x∧3＋6×x∧2＋18×x＋20
    x^2*(34.29-x)=0.489*4*11.43^3
    lnx=0.0125x+3.3111
    x/4-2x
    10x×10x-3x-132300＝0
    2x^3+-x^2+-x+1/4=0
    X*0.03=X-125
    （sinx）∧3
    30-4p=-15+5p
    -21.5+x-x*10%/4-30*10%/4=50

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