x+78=91
    （a-22）（-5a+20）=325
    100-3x=100-4x
    3x=4x
    100-3x=4x
    x/(x+11200)=15%
    sinx*sinx+2cosx=-0.25
    sinx*sinx+2cosx=2
    256627=2400a-a*a/2
    14/87-10/125-60/1650+X/126=0.00154（X+84）
    （2685.13-x/1.01*0.01）*1.12=31219.1-x
    29y-36（69.9-y）=0
    (X+200)*(X+200)-x*x=200000
    x = (3*sqrt(11)+38)/5
    10x(1+x)^5+10x(1+x)^4+10x(1+x)^3=20000
    （25.697+x）×0.85＝51.393+67.89-x
    （25.697+x）×0.85＝51.393+68.89-x
    （25.697+x）×0.85＝51.393+69.89-x
    （25.697+x）×0.85＝51.393+70.89-x
    （25.697+x）×0.85＝51.393+71.89-x

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