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7x - 28
7*1,1 - 28=
7,7 - 28 =
-20,3
b) 5(4y - 2)
20y - 10
20* -2 17/20 - 10=
57 - 10 =
47
c) (3 - 6a) * 8
24 - 48a
24 - 48* - 2 3/4 =
24 + 132=
156
Wydaje mi sie, że dobrze, ale nie jestem pewna ;)