（25.759+x）×0.85＝51.519+71.078-x
    （25.759+x）×0.85＝51.519+71.078-x
    （25.759+x）×0.85＝51.519+72.078-x
    （25.759+x）×0.85＝51.519+72.078-x
    25+x＝97.402-x
    5x+x➗5=52
    5x+x=52×5
    6x^2-x-1=0
    5x+1=4.7(x+1)
    0.9+1.5x=0.97(x-1)
    0.9+1.5x=0.97(x+1)
    -2X（X+5）=3（X-5）-6
    (2x - 1) / (x + 1)²
    x=(x+5000)/1.06*0.06*1.12
    （y-32.13）/y=0.2
    90+arctan5x-arctan5=50
    （y-124.34）/y=0.2
    1.1*1.1-2.5x*1.1+2x=0
    6.8*6.8-2.5x*6.8+2x=0
    3.14/(sqrt(1-0.36)x)=0.8

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