x+x*0.04=449.6
    5x^4+8x^3+2x^2+32x+24=0
    2/13x+30=（x-2/13x-30）*5/8
    （25.851+x）×0.85＝51.702+67.353-x
    （25.851+x）×0.85＝51.702+68.353-x
    （25.851+x）×0.85＝51.702+69.353-x
    （25.851+x）×0.85＝51.702+70.353-x
    （25.851+x）×0.85＝51.702+71.353-x
    log(2,x)+x=0
    2^x+x=0
    3(x^2)-12x+32/5=
    3(x^2)-12x+6.4=
    x^2-2x+3.6=
     120（x+10）-100x=2800
    i-7%/8%-7%=（2.6087-2.6243）/（2.5771-2.6243）
    85=X-87+X-86
    30/(2.7*sqrt(1+2.7^2/25)*sqrt(1+2.7^2/100))*x=1
    2.27=9.9/(9.9-X)
    (X+3)-(2-5x)=-5
    X²+3X+282=0

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