3*157+2*243-3*248-3x=-303
    8y²+49y+81=0
    15-3(4+2x)+5(7+3x)=21
    x*99.975%-126.289*100.025%=1/10
    (X-191673.674242)/191673.674242=0.7
    (253009.25-X)/X=0.32
    x∧4－4x∧3+3x∧2+10x-20＝0
    y-0.15y=51
    x^2-11.4X+32.2=0
    a×0.6=32.9
    a×0.6=26.9
    a×0.6=46.9
    a×0.6=19.9
    a×0.6=11.9
    6^x=x^18
    (x-0.1958）（x-0.2066）(x-0.2066)=1.9*10^-68
    x+1=3
    -90-45-26.5+57.3x=-180
    X-X/1.01*0.011-X/1.01*0.8*0.2=3500*12
    X-X/1.01*0.01-X/1.01*0.8*0.2=3500*12

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