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    1÷12+x=12
    (2.4+x)÷(12+x)=0.25
    1+x
    x+(x*0.05)/2=1567500
    (x+1.5x)×4=580
    x+(x*0.05)*2=1567500
    (x+1.6x)×4=580
    (x+1.5x)×4=580
    11.5=50x
    0.2=(4.5+50x)÷80
    50x÷80
    1+3x
    0.2=(30×0.15+50x)÷80
    x^2+2x-3=1/3x+1
    21.335x - 8.673=50
    20.667x - 8.669=50
    0-0.3-(-90) = x
    0+0.3-(-90) = x
    0+0.3-(-90)=x
    21.668x-11.67=50

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