4x=91.1×(5.05+4+3+3)+742.55×(4+3+3)+1233.99×(3+3)+1531.41×3-556.92×(15.5-1.86)^2/6
    4x=91.1×(5.05+4+3)+742.55×(4+3)+1233.99×3-434.44×(12.5-1.86)^2/6
    4x=91.1×(5.05+4)+742.55×4-312×(9.5-1.86)^2/6
    (x-1)/0.3-2x=(0.1x+0.2)/0.05
    0.35c+0.2(12-c)=3.45
    4x=91.1×5.05-152.76×(5.6-1.86)^2/6
    85-[-0.01*(1500-x)+100]=80-[-0.01*(1000+x)+100]
    x=91.1×5.05-152.76×(5.6-1.86)^2/6
    9.6-8x=6+2x
    3.1415926^3
    pi^3
    6r+16(5-r)=70
    π^3
    （1.2-x）/（6+2x）=1/8
    x=(4250.32+689.8-91.1-742.55-1233.99-1531.41-1505.33)/4
    9+（15/4+3/2x)×（15/4+3/2x)=5×（6/5+6/5x）×（6/5+6/5x）
    10.25a+7.5(8-a)=65.5
    x*(18*(x^2)-15*x-1250)=0
    lnx=18.73
    x=(4250.32+689.8-91.1-742.55-1531.41-1505.33)/4

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