(y-28)/3=6y
2x+y=8
10^{2r+1}=17
(2c-1)(3c-1)=11
9+36:4+5=
($\frac{x}{y}$) ^{3} ( $\frac{y^{2}x }{z}$) ^{4}
x=5y-22
x/4+10=2y
20 1/4
20-12a+ $a^{2}$ =0
6x+10=3-x