0.63=0.9^x
    11x+64-2x＝100-9x
    (12/x)-12/(4+x)=4
    12/x-12/4+x=4
    64k^4+4k^2+32k^3+3k=0
    （16k²+1）k²+（8k²+3）k=0
    tany－y＝4.637
    tany－y＝4.637
    tany－y＝4.637
    tany－y＝4.637
    tany－y＝4.637
    tanX－X＝4.637
    tanx－x＝4.637
    tanx－x＝4.637
    tanx－x＝0.5
    tanx－x＝0.5
    tanx－x＝0.5
    inv X＝0.5
    invX＝0.5
    invx＝0.5

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