(11.5*1620*78)/415
    11.5*1620*120*(1367-120/2)
    5.62+0.4*(25.14)/1.3
    -2.41+0.4*(-16.34)/1.3
    5.62+0.7*25.14/1.3
    -2.41+0.7*(-16.34)/1.3
    1.2*5.62 + 1.4*25.14
    1.2*(-2.41)+1.4*(-16.34)
    1.3*(140*2)/(4*3.62)
    -1.3*(140*2)/(4*3.62)*(0.86-0.84/4)
     0.20+2*0.15+1.4+2*0.86 =
    (0.20+2*0.15)+2*0.86
    0.60+2*0.15
    (-7)^3-63*7+6*49+3
    (square5-4)/2
    sin18
    (-2)^(2/5)+(-2)^(7/5)
    (-1/2)^(-2/5)+(-1/2)^(-7/5)
    (-2)^(-2/5)+(-2)^(-7/5)
    ((x+1)^2-2)/(x+2)=x

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