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x=10
spr. 10 razy 5x= 50
b) 2y+13=29
-13= -13
2y=16
y = 16:2
y=8
spr. 8 razy 2= 16 16+13= 29
c) 3y+2 = 2y+6
-2y -2y
1y+2 =6
-2 -2
1y=4
spr. 4+2=6 6+2y = 2y + 6
d) 3k+8 = k+20
-k -k
2k+8 = 20
-8 -8
2k=12
k= 12:2
k=6
spr. 6 razy 2=12 12+8=20 20+k = 20 +k