x
    70*10＾6=23*250x(565-x÷2)
    70*10＾6=26*250x(565-x÷2)
    70*70＾6=23*250*x(565-x/2)
    x=5/4÷2
    2x+x=5/3
    3x=3/5
    x-1/lnx
    （1.3621-0.00406V）60=（30%V-28）+20
    50=x+2080/（578X）
    50=x+2080/578X
    578x+2080/（578x）=28900
    578x+2080/578x=28900
    （578x）^2+2080x=28900
    x+27=4x+3
    4-3（100-X）^2/1600
    2.02x＾2+96.8x=193.6
    35.32*(x+3.8) = 50.41x+112.058
    35.32*(x+4.2) = 48.11x+136.362
    35.32*(x+4.2) = 48.11x+136.362

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