17) -4х-3у=-49,

18) Х+4=3х,

19) -3у+7=2у.

20) 5а-1,5=2а.

21) -0,2х+7=-1,6х,

22) t+5=t-7,

23) 2у=7у,

24) -3к+8=-3к+9,

25) 6,9-9n=-5n-33,1, решите правильно даю 100 балов
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