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    -28t^2-8t+21
    x+1=5
    7x+2=30
    0.01X+0.3*(114672.26-X)=17349.64
    0.01X+0.3*(165832.34-X)-17682.05=0
    x^2+4x+3-√82=0
    x^2+4x+3+√82=0
    0=5+x+3
    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

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