5(2x-10)(x-10)=3000
    3x-x^2=0
    -0.5x+7=(7÷2)x+3
    X*X-3X=40
    -x2-x+3=0
    2x-18=-x+3
    cosx+sinx/(cosx+2)^2=0
    111x*12=1111
    cosx+sinx/(cosx+2)^2
    5(2x-10)(x-10)=3000
    1.3x-x=150
    3n²+n=4734
    (21-3x)(10-2x)=90
    (21-3x)(10-2x)
    m*m+m＝3
    1.3x-x=150
    （n+1）²-n＝133
    （n+1）²-n＝130
    n²+n＝130
    7x^2+160x-900=0

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