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2d=2 |2
d=1
b)6e-7e=5+2
-1e=7 |1
e= -7
c)6f-f=2+1
5f=3 |5
f = 3/5
5d-3d=-2
2d= -2 /:2
d= -1
b)6e-2=7e+5
6e-7e=5+2
-1e = 7 /: (-1)
e = -7
c)6f-1=f+2
6f-f = 2+1
5f = 3 /:5
f = trzy piąte