X-(X/1.01*5.3%)=644844.74
    -X-3
    n^2-6n-30=0
    2x^2+x+1=0
    29=25+(x-22)(0.064+0.105+0.06)+0.5*0.7
    29=32+(x-22)(0.064+0.105+0.06)+0.5*0.7
    29=22+(x-22)(0.064+0.105+0.06)+0.5*0.7
    30=22+(x-22)(0.064+0.105+0.06)+0.5*0.7
    30=22+(x-22)(0.064+0.105+0.06)+50*0.7
    (x+4)^2=(x+4)(2x-5)
    (x+4)2=(x+4)(2x-5)
    500000*x-5*500000=3000000+80*500000
    -18500x*x+1320x+108=0
    x*（1-0.2）=8
    x^3+4x^2+3x-10=0
    16%=24%+r+24%×r
    25÷（1-1÷（0.6+0.6））=x
    1-1÷（0.6+0.6）=x
    2X-1.5X=15
    1*2X-1*1.5X=15

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