a). a = b + 3
(a + b) : 2 = 14,5/*2
a-b=3
a +b=29
zsumujemy
2a=32 //2
a=16
a=16
b=29-16
a=16
b=13
b). x = y - 8
y = 3x
x-y=-8
-3x+y=0
zsumujemy:
-2x=-8//(-2)
x=4
x=4
y=3x
x=4
y=12
c). u = v + 6
u + v = 4v
u-v=6
u-3v=0/*(-1)
u-v=6
-u+3v-0
zsumujemy
2v=6//2
v=3
v=3
u=v+6
v=3
u=9