455* x＝300*x
    (1.5+2x)(1+2x)=3
    2x²-50x+300
    （50/x+6.8）*0.493=(40/x+8.5)*0.507
    2∧x=32x
    27=21+4X
    27=21+4X
    27=21+4X
    0.27=21+4X
    27%=21+4X
    4*（x+28)^0.5+4=x
    3x=6
    √x＾x=√(√((√2)/2))
    5x^2+6x-12=0
    (10-0.5x)(48+4x)=510
    (40-0.5x)(30+4x)=510
    -50x²-100x=1650
    (21-x)x＝(14-x)10+70
    17x＝(14-x)10+70
    (55-35-x)(10x+100)=1760

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