x/11.3+x=24.5
    (16x)²+(9x)²=3716.1216
    16x²+9x²=3716.1216
    16x²+9x²=3716.1216
    16x^2+9x^2=3716.1216
    (16x)²+(9x)²=3716.1216
    (210/136)x+51=52.5x
    27a^2-(a+1)^2(8a-1)
    27a^2-(a+1)^2(8a-1)
    27a^2-(a+1)^2(8a-1)=0
    abs(2x-4)=abs[(8-4x)/(4x+2)+2x]
    4x∧2-16x+16=(4x∧2+16-16x∧2)/(4x∧2+1+4x)+4x∧2+(16x-8x∧2)/(2x+1)
    4x2-16x+16=(4x2+16-16x2)/(4x2+1+4x)+4x2+(16x-8x2)/(2x+1)
    20lgx=100
    x-2187＝0.06x
    (82-75)/(75-61)=(85-X)/(X-71)
    82-75/75-61=85-X/X-71
    (2100-500*x)*5=500
    （82-75）/（75-61）＝（85-X）/(X-71)
    x²＝50-2x

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