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17-x=-30
-x=-30-17
x=47
b)
2x+10=40
2x=40-10
2x=30
x=15
c)
5/7*x=1,4 /*7/5
x=14/10*7/5
x=98/50
x=1i24/25
d)
0,25:x=0,05 /*x
0,25=0,05x /:0,05
x=5
odp.
Odpowiedź c).