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8x+2x=16
10x=16
x= 10/16
b) 3a-2=8a
3a-8a=2
-5a=2
a= -5/2
c) 5z+3=20z-27
5z-20z= -27-3
-15z= -30
z= 2
Myślę, ze pomogłam :D