25/1=38.6+49x/1.78+2x*100
    25/1=38.6+49x/1.78+2x
    x=75+x
    25=38.6+49x/1.78+2x
    25=38.6+41.6x/1.78+0.64x
    x/(x+1) = 100
    25=38.6+41.6x/1.78+0.64x
    x/(x+1) = 1
    x/(x+1) = 0.05
    1600+9t^2-240t=9t^2+1024-192t+4
    1600+9t^2-240t=9t^2+1024-192+4
    100+75x/10+x=25
    50*21+ x*41=(100+ x)*25
    （X+1）/X=10
    50*29.1+ x*65=(100+ x)*25
    100*29.1+ x*65=(100+ x)*25
    100*29.1+ x*20=(100+ x)*25
    （X+1）X=10
    100*21.7+ x*491=(100+ x)*25
    100*21.7+ x*30=(100+ x)*25

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