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    π*(D^2-74^2)=10000000*4*0.042
    20x=100/9+5xx
    20x=100/9+5x2
    70x(3.45+1.7)+22x(2.7+1.4)+5x(2.6+0.8)
    10x^2-7.5x+1.25=0
    x^4+x^3-320=0
    500/(50+j450)
    100t^2+120t-2.4=0
    x^2-9.6+17.8=0
    x^2-9.6x+17.8=0
    (100000+x)*3=10x+1
    (14.4+x)/(180+x)=0.1
    14.4+x/180+x=0.1
    x=cosx
    x=tanx
    0.64x = 256
    400(1-X)(1-x) = 256
    25(1+X)(1+x)=36
    (17-X)(12-X)=176
    4(2X+1)(2X+1)-9(2X-1)(2X-1)=0

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