58+38+52-（18+16+x）+12 = 100
    58+38+52-（18-16+x）+12 = 100
    （x+5）*（x+5)*(x+5)*(x-5)=216*216
    58+38+52-（6+4+x）+12 = 100
    58+38+52-（6-4+x）+12=100
    148-10+x=112
    sin(x2+2)
    -2x^3+6x^2+6x-5=0
    (x-400-200)*(1-25%)/8000=(x-400-450)*(1-25%)/7000
    5x+15=25+8x-2
    (x-600-300)/7000=(x-256-368)/6360
    x-600-300/7000=x-256-368/6360
    x+2/30=1-x/40
    x^1.28=1
    3x+6=48
    2x+8
    (2-x)^2+9/4=x^2
    (1350-8.4x^2) /(x+0.509)^2 +66.6=210.553
    (1350-8.4x)^2 /(x+0.509)^2 +66.6=210.553
    160x=240×（30-x）

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