6X-4=8X-18
    6X+4=8X+18
    4-2x=x²
    -30sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 216/5*sin(x)=0
    -29.4sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 216/5*sin(x)=0
    -29.4sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 54/5*sin(x)=0
    -3*9.8sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 54/5*sin(x)=0
    -30sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 54/5*sin(x)=0
    （（X-300）*0.75）/3300=（（x-300-360）*0.75）/3000
    （X-300）*0.75/3300=（x-300-360）*0.75/3000
    （X-300）*0.75/3300=（（X-300）*0.75-75）/3150
    （x-300-360）*0.75/3000=（（X-300）*0.75-75）/3150
    x*99.975%-132.000*100.025%=1/10
    x*99.975%-132.041*100.025%=1/10
    3y-8=2y+5
    1.8X=5.6
    7x-8.4=2
    m^2-2*m+10=0
    x^4-4*x^3-100*x^2+1600=0
    13.11c=（3.3+c）×7.92

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