0.08/0.00648
factorise
h^2+6h--7
f/-5=-2
96/2x=3x
-6b=-18
0.16/0.168
-11x+2y=36
20x-47y=-90
solve for x and y
(x+4/2)(x+5)=x(x+4)-35
use echelon form to solve
X+2y-3z=0
3x+3y-z=5
x-2y+2z=1
4e=-12
