(40+x)/(20+x)=182.4/107.6
    B*B+B=600
    abs-10+abs3t+abs-1=abs6-abs2t-abs1
    abs（-10）+3t-1=abs6-2t-1
    -X^2+3x+4=-1/4x+1
     x^2+36 = (8-x)^2
    x^2+36=(8-x)^2
    3x^2×(x^3+4x^2+5x+2)=x^3×(3x^2+8x+5)
    2-3（t-4）=-2-2（t-4）
    x+4x=75.5
    12x^2-9x=15x-9
    (2x+15)×(x^3+50x^2+10000x)=(x^2+15x+50)×(3x^2+100x+10000)
    3^2+（5x-3）^2=（4x-3）^2
    0.2（x+20）=0.6x
    x/10+x/15+x/21=6
    5x+7-4x+6=11
    cos10πt
    （500-x）*1.25 x=520
    12x²+10x+1=0
    （x+18）/（x-18）=74/65

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