609x²+268x-175=0
    (M+3)(M+4)(M+9)=996
    x=9480+0.0672x
    x*x-5x=2250
    y^2+48y-122=0
    x/(0.10-x)=10.73
    x＾7÷(0.10-x)＾7=2.14*10^-77
    2（x+1）=4（x-1）
    －2/500x²+2/5x＝10
    20%x÷20%=72÷20%
    20%x=72
    （1-80%）x=72
    2x-30%x+30%x=9.2-30%x
    2.3x÷2.3=9.2÷2.3
    2x+30%x=9.2
    0.2x÷0.2=3.36÷0.2
    18-2x+4x=40-4x+4x
    x^2+60x+600=0
    4x^3-4x^2+9＝0
    x-4/2022+x-3/2023+x-2/2024+x-1/2025=4

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