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    0=5+x
    200-2y/4=310-y/2
    200-2y/4
    -225x+1200=150
    1-(2x-1)/3=(x+1)/4
    4.2*10^3*5*10^5*x-4.2*10^3*5*10^5*30=8.4*10^9
    x2
    3=100×(x-216)/(x×600/100)
    25x/5-8x=40(5-8x)+5x(8-5x)^2/(8-5x)^2
    0.12*(20+x)=2.8+28/x
    0.71*x*2=3.51
    0.72*x*2=3.51
    123—q
    0.1x+2.5x²=0.08
    x-(0.6x)=60
    16x^5-20x^3+5x=0
    (x-3)×(x-3)+(x+3)×(x+3)×(x-1)×(x-1)=18
    x×x-2×x+1=0
    -x²+2x+3=0
    1.84a×0.98=1.14×500×0.2

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