3x+7=32-2x
    1.2-0.9+5x=0.8
    7(x-6)=2x
    7+x-2(x-1)=1
    2(x-2)+2=x+1
    (5y+1)+(1-y)=(9y+1)+(1-3y)
    17+X/22+X=95%
    200*x^2+(5+2*sqrt(10))*x-22.6＝0
    6(2x-1)-3(4x-1)=4(3x-2)-1
    x+1/2（43-x）=30
    4x-8(x-15)=180-6x
    400+200x+200(x+1)^2=1400
    9000-2x^2-190x=8448
    arcsinx+arccosx
    arcsinx+arccosx
    arcsinx+arccosx
    27t-5t²＝9.6
    27t-5t²＝9.6
    (3-x)^2+9x^2=9
    11/15-x+3/5=1/2

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