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x=12/3
x-y=1
x=4
4-y=1
x=4
-y=-3 / (-1)
x=4
y=3
B)
5y=2 /5
x+y= 2 i 2/5
y=2/5
x+2/5=2 i 2/5
y=2/5
x= 2 i 2/5-2/5
y=2/5
x=2
C) 4y-x=6
17y=0
0-x=6
y=0
x=-6
y=0
D)a=b
2a+b=9
a=b
3a=9/3
a=b
a=3
3=3
a=3
f)
3r=s
3r+s=24
3r=s
6r=24 /6
3r=s
r=4
3*4=12
r=4
s=12