3x²＋x＝108
    x+（2√10-x）²=5
    x-10+x+1+0.5*x+2*x+2=4x
    33+（x-20)0.7 = 0.65x
    33+（x-20)0.7 = 0.6x
    33+（x-20)0.7 = 0.7x
    33+（x-20)0.7 =0.75x
    44.8+（x-20)1.1 = 60
    33+（x-20)0.7=40
    5-1-2*10/3(t-15/4)=2
    sin（2πx/5）=
    33+（x-20)0.7=0.8x
    sin（2πx/5）
    44.8+(x-20)1.1 = 1.3x
    44.8+(x-20)1.1=1.5x
    1/6(x+3)(x-4)=0
    X-(X*0.06)=6341.78
    1/x
    (8x-4X)÷2=25
    2(12x-50)=9/8*12(x+18)

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