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6/9 = x/30
4/12 = 15/x
7/m = 5/35
x/9 = 90/100
5/d = 6/18
| -8y-2+y=-5y-16 | | 6/9=x/30 | | 18s^2-21s+12s-14=0 | | 4/12=15/x | | 7/m=5/35 | | x/9=90/100 | | 5/d=6/18 | | x=y+80 | | 3/5=m/20 | | b^2+6b+55=0 | | 5/10=15/y | | d/12=4/8 | | 22m^2-85m+28=0 | | 12v^3-52v^2+16v=0 | | 10p=250 | | -6k+ar=r-7yfora | | 6s^2+4s=0 | | 7x-5y=48 | | -7x-5y=-48 | | 1X+0.1X=27000 | | 8*-920=7080 | | 2y^2-7y-22=0 | | 56/2(2a)^2b^6 | | M+80=360 | | -9n(10n-9)=0 | | x^2-2y^2=39+6x+16y | | log(x)=-3.7 | | 4x-7=2y-3 | | log(6x-4)+log(x-7)=2 | | y-0=(2b/2a-c)(x-c) | | 4xy-x^3-2y^3=0 | | 5x/20=2/10y |