2y+4+3.2*3.2+3.2*2*y=0.8
    4x+4=28
    y+2y+4+3.2*3.2+3.2*2*y=0.8
    （x-74）÷（77－x）＝2
    4x^3+15x^2+16x+6=0
    （15+x)(100-4x)=1500
    x(1-x)＝0.3588
    x(1-x)＝0.3588
    x(1-x)＝0.3588
    0=-0.4x*x+1.6x+2
    0=-0.4x+1.6x+2
    25x−(4x+10.5)=10.5
    x²＝0
    x^3+5x^2+8x+3=0
    x²＋17x-17750＝0
    2x²＋34x-17750＝0
    14.3×300×X（559.5-X/2）＝187.8525
    14.3×300×X（559.5-X/2）＝187.8525
    x^1/3➗x
    x^3=1

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