【（220+260）*21-x】*0.9=7060
    25+x＝32.94+150.015-x
    500y-y^2=62500
    600xx+180xx−60000=642000
    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

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