70.92+11.72y=29.574y+29.758
    0.4*5X=
    0.4*5X=
    0.4*5X=
    0.4*5X=
    （8×90＋X－740－53.6×10％）×（1－25％）＋357.29＝424.36
    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

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