18:x+4=9:x-3
3-(1+6a)
(5z-2)/3 - (4z-4)/2 = (2z+1)/3
5^(x+1)-3/25=2.5^x
solve x
(64-x^2)^3
1/4+1/4=
x= 14-4y
5x-13y =4
(y+5)(y-3)+7 =(4+y)^2 -12
2 * p
