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    3t*t+80t-400=0
    88X+(90-X)*83=87*90
    (7890-88X-90)/(90-X)=88
    2x^2+4x-3=0
    2x^2+4x-3=0
    3x+4×28-5x/6=18
    3x+4(28-5x/6)=18
    3x+4×(28-5x/6)=18
    4×(28-5x/6)
    5x+1/2=2
    5x+1/2=2
    (x-10)+(x+10)+(x/2)+2x=270
    2.4+x+2.4x=3.9
    4x-5/5x-10=9/10
    ln(1/x)=5.3*ln(2/3/(1-x))
    x∧2+x+9=0
    114514x^2+1919810x+114514=0
    4651231031153103457754527486531548x+15643135246365346316534x = 6341533432413
    4651231031153103457754527486531548x^2+15643135246365346316534x = 6341533432413
    1145141919810x = 1919810114514x

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