X^2-5÷2X+1=0
    X^2-5÷2+1=0
    m-2=m÷4-1÷8
    (x-2)/0.2-(x+1)/0.5=3
    x*0.9*2.55=3.79
    0.75x+25=0.9x-20
    X+400-2/100*(20000+X/0.13)=2200
    1.5x+1.25x=220
    1.333333X+1.2X=220
    143/(85891022/51)*{1752878-(85891022/51)}=x
    49/(85891022/51)*{1752878-(85891022/51)}=x
    (x+8)(x-8)=192
    49/x*(1752878-x)=2
    143/858910.22*(1752878-858910.22) =X
    3/8+x＝9/14
    X^2-10 x+22=0
    X=(X-1100)/0.02*0.13
    (49/858910.22)*(1752878-858910.22)=x
    (49/x)*(1752878-x)=51
    49%x*(1752878-x) =51

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