August 2018 2 38 Report
Rozwiąz układy równań

a)x+x=0
x-y=10

b)8x-6y=10
7x+y=5

c)12p-7r=-16
p-3r=-69

d)11k+17l=45
13k+l=15

e)8a+9b=36
a-16b=210

f)6a-21b=228
a-12b=21

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