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afla nr.nec,din expresiile:
a)(a+27:3)x5=95
b)2+bx9-25=10
c)(c-104+2)x5+3=98
d)(dx4+20):4=12
e)(36-42:e:(15:3-4:1)-20=10
f)11-(7x5-9x9:f:3):8=7