600(1-x)^2=486
    1/4x+2/5×(19-x)=4/5x
    (1-3÷4)x+(1-3÷5)×(19-x)=(1-1÷5)x
    (4x^2-4x)/(2x^2+1)=0
    （ X-60）（20+500-5 x）=2400
    32(x-1)^2/3+16sqrt(3)(x-1)/3=x^2-2x+4+4x(x-1)/sqrt(3)
    -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

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