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determinati x din egalitatea:
[(4×5-x)×3+8]:7=2
Urgent va rog
Dau coroana


Răspuns :

(20-x)×3+8=7×2
(20-x)×3+8=14
(20-x)×3=14-8
(20-x)×3=6
(20-x)=6:3
20-x=2
x=20-2
x=18
[(4×5-x)×3+8]:7=2
(20-x)*3+8=2*7
60-3x=14-8
3x=60-6
x=54:3
x=18