4.32*（25-x）+174=（6.48*x+61+50）/1.5
    283201980*12x+12=172
    625t^6-75t^4+0.12=0
    20×(63-x)+25x=1415
    20×(63-x)+25x=1415
    x^3+16.5x^2+30x+10=0
    2x^3+33x^2+60x+20=0
    x^3+2x^2+3x=0
    x^4-18x^2-63=0
    x^2-18x-63=0
    2000（1+x）²=3380
    x^4-18x^2-63=0
    4x^2+16x+40=0
    4x^3+24x^2+72x+80=0
    x^4-43.5x^2+45.5=0
    x^2-43.5x+45.5=0
    x^4-43.5x^2+45.5=0
    5x^4+42x^3+130.5x^2+159x+45.5=0
    3x+3-12=4x-2
    (x+1)/4 -1=(2x-1)/6

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