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60*90-50*{84-[45-(7*X-9)*2]}-10=2240
sa se afle x
P.S. X e 3 dar vreau rezolvarea ca mie nu-mi iese


Răspuns :

60*90-50*{84-[45-(7x-9)*2]}-10=2240

5400-50*{84-[45-(7x-9)*2]}=2250

50*{84-[45-(7x-9)*2]} = 5400 - 2250=3150

84-[45-(7x-9)*2] = 3150 : 50 = 63

[45-(7x-9)*2] = 84-63=21

(7x-9)*2 = 45-21=24

7x-9=24:2=12

7x=12+9=21

x=21:7

x=3