0=0.001X^2+(-0.6071×0.00000001)X+(0.0203×0.000000000001)
    0.001X^2-0.6071×10^-10×X-0.0203^10-12=0
    197=（（0.021*x^1.85+326）^0.5）*x^0.84
    0.001×X-0.6071X+0.0203=0
    20000=25(x+2x)+25x
    30÷X十25=85
    37一X一2X=4
    3680000=1.13x
    3x-5=x+1
    6x+90=15-10x+70
    2a+4=a-3
    10X=15
    1.25=20.13*0.003*1.3*(4.8101-x)
    1.5=20.13*0.004*1.3*(5.4575-x)
    300=20.13*0.004*1.3*(5.4575-x)
    43700+1400X=(2100-6x)x
    43700=(2100-6x)x
    √（X²+X）＝2000
    √X²+X＝2000
    350*x÷（100-x）=318

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