x/9+(1-x)/5=x/3+(1-x)/7
    (x-42210370.66)*0.9422+42210370.66-x*0.02-x*0.03=630626366.95
    8.2×（1+0.125）^X=10
    2.9/7.1×30/X=0.04
    5^2=(19/7)^2+x
    5^2-x^2=6^2-(7-x)^2
    817700=500*500+y*y
    905*905=500*500+y*y
    440*440+790*790=500*500+y*y
    440*440+790*790=x*x
    67x+8.19x∧2=16077.8
    （36-6t/5）²+t²＝4t²
    xsin(25136.94/x)=435
    x*sin(25136.94/x)=435
    xsin(877*90/π*x)=435
    24*0.787+25*(0.213-x)+26*x=24.305
    470x/(470+x) = 380
    xsin(877/2*x)=435
    x=14
    x=27

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