8790-（x×50）=6190
    x^2+10x+1=0
    1.8934*x^0.4+0.011667*x=15.219
    x/(x+1)=0.26
    5x-262.5=62.5
    (x+1)÷4=(x-1)÷3
    2000=-19816x+23702
    q^(2)-1.5q+0.5=0
    x/(x+1)=0.28
    x/(x+1)=0.5
    x/(x+1)=0.23
    3(x-5)≥2(x+5)
    x^3-5x^2+2x-10=0
    x/(x+1)=0.05
    x^3-10x+3=0
    x3-10x+3=0
    (13x+8)÷3=5x-1
    6x÷8=12
    (x-9)[(x-42)(x-56)-46*46]-225(x-56)-20*46*15-20[15*46+20(x-42)]
    18-(12-2x)=16

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