30-0.5*2t(5-t)=26
    (5-t)(5-t)+4t*t=25
    （40-x)(2x+20)=1600
    2723*0.562*1.2*794/(794+x-36)=1006
    10x-x×x=0.8×x×x
    xx-(4+1)x+4-3=0
    xx-(-4+1)x-4-3=0
    (k+1)(k+1)-2(k-3)=23
    5x-x=1
    x(77-4x+3)=440
    x(77-4x+3)=300
    (1+x)(1+x)=1.44
    xx-4x-5=0
    6m-9=m(2m-3)
    xx-4x+5=0
    x(x-16)=161
    x*x+2x-2024=0
    9x²=(9-9/5x)²+(12-27/5x)²
    x^2+12x-55=0
    2x^3-x^2-1=0

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