#1
{4x+y=3|*2
{6x-2y=1
+{8x+2y=6
+{6x-2y=1
14x=7|:14
x=0,5
2+y=3
y=3-2
y=1
#2
{2x-3y=11|*2
{4x+5y=-11
-{4x-6y=22
-{4x+5y=-11
-11y=33|:(-11)
y=-3
2x+9=11
2x=11-9
2x=2|:2
x=1
#3
{2(3x+2y)+9=4x+21
{2x+10=3-(6x+5y)
{6x+4y-4x=21-9
{2x+10=3-6x-5y
{2x+4y=12|*4
{8x+5y=-7
-{8x+16y=48
-{8x+5y=-7
11y=55|:11
y=5
2x+20=12
2x=12-20
2x=-8|:2
x=-4
#4
{13p-12g=14|*3
{11p+18g=40|*2
+{39p-36g=42
+{22p+36g=80
61p=122|:61
p=2
26-12g=14
-12g=14-26
-12g=-12|:(-12)
g=1
#5
{-3(x-2y)+4(y-x)=2x-y-2
{3(2x-y)+2(x-y)-1=3x-2y
{-3x+6y+4y-4x-2x+y=-2
{6x-3y+2x-2y-3x+2y=1
{-9x+11y=-2|*5
{5x-3y=1|*9
+{-45x+55y=-10
+{45x-27y=9
28y=-1|:28
y=-1/28
-9x-11/28=-2
-9x=-2+11/28
-9x=-1 17/28|:(-9)
x=45/28*1/9=5/28