2x-y=1
4x-2y=2
85x+23x=
x+y=3
2x+2y=3
-X+2Y=1; 5X-9Y=-3
3x-y=1
3x-y=-5
(105/100)^(n-1)=2
7X+3Y+1=2X+12Y-2
6X+5Y=7X+3Y+1
6X+5Y=7X+3Y+1=2X+12Y-2
resolve into factor of (b+c)(c+a)(c+a)+abc
